Docs: Update and restructure documentation for upcoming release (v5.0.0)

**CHANGELOG.md**:
- Added [Unreleased] section with complete feature documentation
- Documented QR code support for Station mode
- Documented non-blocking WiFi connection architecture
- Documented structured logging system implementation
- Documented enhanced status command with comprehensive network info
- Documented FreeRTOS task architecture improvements
- Documented web server responsiveness optimizations
- Listed all bug fixes with root causes and solutions
- Added technical specifications (memory, performance, build stats)
- Migration guide and breaking changes section

**README.md**:
- Added "What's New in v5.0.0" section with 8 major features
- Detailed QR code functionality with use cases
- Non-blocking operations explanation with code examples
- Structured logging system overview
- Enhanced status command documentation
- FreeRTOS task architecture description
- Web server improvements summary
- Bug fixes and refinements list
- Quick links to documentation

**docs/RELEASE_NOTES_V5.0.0.md** (NEW):
- Comprehensive 500+ line release documentation
- Detailed overview and highlights
- Feature-by-feature deep dive with examples
- Code snippets showing before/after comparisons
- Use cases and benefits for each feature
- Complete bug fix documentation with root causes
- Technical specifications (memory, performance)
- Migration guide for v4.3.1 users
- Known issues section
- Future roadmap preview

**platformio.ini**:
- Updated version string to "5.0.0" in all environments
- Updated comment header to reflect new features
- All 6 build environments updated consistently

**Documentation Restructuring**:
- Moved TFT_TASK_ARCHITECTURE.md to docs/technical/
- Moved WIFI_TASK_ARCHITECTURE.md to docs/technical/
- Updated docs/DOCUMENTATION_INDEX.md with new locations
- Updated docs/README.md with complete feature list
- Reorganized technical documentation structure
- Improved navigation and discoverability

**docs/DOCUMENTATION_INDEX.md**:
- Added FreeRTOS Task Architecture section
- Added TFT Display Task Architecture reference
- Added WiFi Command Task Architecture reference
- Updated Technical Documentation section
- Improved cross-referencing between documents

**docs/README.md**:
- Updated feature highlights with latest additions
- Added QR Code Support to features list
- Added Non-Blocking WiFi Operations
- Added Structured Logging System
- Updated documentation organization structure
- Improved navigation with clear sections

**Key Features Documented**:
1. QR Code Support for Station Mode
2. Non-Blocking WiFi Connection
3. Structured Logging System
4. Enhanced Status Command
5. FreeRTOS Task Architecture
6. Web Server Improvements (10x faster)
7. Critical Bug Fixes (connection timing, TFT updates, mode switching)
8. Performance Optimizations

**Documentation Statistics**:
- CHANGELOG: +250 lines
- README: +150 lines
- RELEASE_NOTES: +500 lines (new file)
- docs/README.md: Updated with new features
- docs/DOCUMENTATION_INDEX.md: Reorganized structure
- Architecture docs: Moved to docs/technical/
- Total: ~1000 lines of documentation updates

**Build Verification**:
- All environments compile successfully
- Flash: 1,161,085 bytes (80.5%)
- RAM: 53,072 bytes (16.2%)
- No breaking changes

Author: arunkumar-mourougappane

CHANGELOG.md

@@ -5,37 +5,48 @@
 Comprehensive guides for using all features of the ESP32 WiFi Utility:
 
 ### Core Features
-- **[Web Configuration Guide](WEB_CONFIGURATION.md)** - 🆕 v4.2.0: Complete web-based configuration system
-- **[Configuration System](CONFIGURATION_SYSTEM.md)** - 🆕 v4.2.0: Persistent AP and Station configuration
+- **[Web Configuration Guide](WEB_CONFIGURATION.md)** - Complete web-based configuration system
+- **[Configuration System](CONFIGURATION_SYSTEM.md)** - Persistent AP and Station configuration
+- **[Port Scanner](PORT_SCANNER.md)** - 🆕 v4.3.0: Port scanning and service detection
+- **[Signal Strength Monitor](SIGNAL_STRENGTH_MONITOR.md)** - 🆕 v4.3.0: RSSI monitoring and analysis
+- **[Channel Graph](CHANNEL_GRAPH.md)** - 🆕 v4.3.0: Visual spectrum analysis
 - **[Channel Analysis Guide](user-guides/CHANNEL_GUIDE.md)** - Professional spectrum analysis and AI recommendations
 - **[Latency Testing Guide](user-guides/LATENCY_GUIDE.md)** - Network performance and jitter analysis
 - **[Enhanced WiFi Scanning](user-guides/ENHANCED_SCANNING.md)** - Advanced network discovery and analysis
 - **[iPerf Network Testing](user-guides/IPERF_GUIDE.md)** - Comprehensive throughput and performance testing
 - **[Web Interface Guide](user-guides/WEB_INTERFACE.md)** - Complete web-based dashboard documentation (Available on both boards!)
 - **[NeoPixel Status Display](user-guides/NEOPIXEL_GUIDE.md)** - RGB LED status indicators (Feather ESP32-S3 TFT only)
 
-### Quick References (v4.2.0)
-- **[AP Config Quick Reference](AP_CONFIG_QUICK_REF.md)** - 🆕 Access Point configuration commands
-- **[Station Config Quick Reference](STATION_CONFIG_QUICK_REF.md)** - 🆕 Station configuration commands
-- **[Responsive Menu Guide](RESPONSIVE_MENU.md)** - 🆕 Mobile-optimized web interface
+### Quick References
+- **[AP Config Quick Reference](AP_CONFIG_QUICK_REF.md)** - Access Point configuration commands
+- **[Station Config Quick Reference](STATION_CONFIG_QUICK_REF.md)** - Station configuration commands
+- **[Responsive Menu Guide](RESPONSIVE_MENU.md)** - Mobile-optimized web interface
 
 ## 🔧 Technical Documentation
 
 In-depth technical information for developers and advanced users:
 
+### FreeRTOS Task Architecture
+- **[WiFi Command Task](technical/WIFI_TASK_ARCHITECTURE.md)** - 🆕 Asynchronous WiFi mode switching
+- **[TFT Display Task](technical/TFT_TASK_ARCHITECTURE.md)** - 🆕 Event-driven display updates
+- **[RTOS Architecture](technical/RTOS_ARCHITECTURE.md)** - Overall task management system
+- **[RTOS API Reference](technical/RTOS_API_REFERENCE.md)** - Task and queue APIs
+- **[Creating New Tasks](technical/RTOS_TUTORIAL_NEW_TASK.md)** - Tutorial: Step-by-step task creation
+- **[Queue Communication](technical/RTOS_TUTORIAL_QUEUES.md)** - Tutorial: Inter-task messaging
+- **[Debugging RTOS](technical/RTOS_TUTORIAL_DEBUGGING.md)** - Tutorial: Task debugging techniques
+
 ### Implementation Details
-- **[Code Improvements v4.2.0](technical/CODE_IMPROVEMENTS_V4.2.0.md)** - 🆕 Technical changes in v4.2.0
-- **[Migration Guide v4.2.0](MIGRATION_GUIDE_V4.2.0.md)** - 🆕 Upgrading from v4.1.0 to v4.2.0
+- **[Library Structure](LIBRARY_STRUCTURE.md)** - Modular architecture overview
 - **[Channel Implementation](technical/CHANNEL_IMPLEMENTATION.md)** - Technical deep-dive into spectrum analysis algorithms
 - **[Test Infrastructure](technical/TEST_INFRASTRUCTURE.md)** - Comprehensive testing framework for dual-board support
 - **[Automated Releases](technical/AUTOMATED_RELEASES.md)** - GitHub Actions automated release system
 - **[Workflow Summary](technical/WORKFLOW_SUMMARY.md)** - Complete CI/CD pipeline and release automation overview
 - **[Implementation Summary](technical/IMPLEMENTATION_SUMMARY.md)** - Complete system architecture overview
 - **[Project Completion Summary](technical/PROJECT_COMPLETION_SUMMARY.md)** - Final project status and achievements
 
-### Configuration Deep Dives (v4.2.0)
-- **[AP Configuration Persistence](AP_CONFIG_PERSISTENCE.md)** - 🆕 Access Point configuration system details
-- **[Station Configuration Persistence](STATION_CONFIG_PERSISTENCE.md)** - 🆕 Station configuration system details
+### Configuration Deep Dives
+- **[AP Configuration Persistence](AP_CONFIG_PERSISTENCE.md)** - Access Point configuration system details
+- **[Station Configuration Persistence](STATION_CONFIG_PERSISTENCE.md)** - Station configuration system details
 
 ## 🚀 Quick Start
 
@@ -49,7 +60,27 @@ New to the ESP32 WiFi Utility? Start here:
 
 ## 🎯 Feature Highlights
 
-### 🆕 v4.2.0: Configuration Persistence & Instant Mode Switching
+### 🆕 v5.0.0: TFT Display Enhancements & System Responsiveness
+- **QR Code Support**: Automatic WiFi credential sharing via scannable QR codes (Station mode)
+- **Non-Blocking WiFi**: Asynchronous connection operations - device stays responsive during connections
+- **Structured Logging**: Professional LOG_* framework with severity levels and component tags
+- **Enhanced Status Command**: Comprehensive network info (signal, uptime, channel, quality)
+- **FreeRTOS Task Architecture**: Dedicated WiFi command task and TFT display task
+- **10x Web Server Speed**: Main loop optimized from 100ms to 10ms for instant response
+- **Critical Bug Fixes**: Connection timing, TFT updates, mode switching, web server compatibility
+
+### 🆕 v4.3.1: Comprehensive Documentation
+- **Port Scanner Documentation**: 1,400+ lines covering fundamentals, use cases, security
+- **Signal Monitor Documentation**: 1,100+ lines with RSSI guide, API integration, best practices
+- **Wiki Enhancements**: 2,500+ lines total, 15+ API examples, 10+ use cases
+
+### 🆕 v4.3.0: Advanced Network Analysis & TFT Display
+- **Port Scanner**: Network security auditing with service identification (25+ services)
+- **Signal Strength Monitor**: Real-time RSSI monitoring with auto-scan capabilities
+- **Channel Graph**: Visual spectrum analysis with interactive web interface
+- **TFT Display Support**: QR codes, mode indicators, network information on both TFT variants
+
+### v4.2.0: Configuration Persistence & Instant Mode Switching
 - **Persistent Configuration**: Save AP and Station settings that survive reboots
 - **Auto-Start/Connect**: Device boots into configured mode automatically
 - **Web Configuration Interface**: Complete configuration via browser
@@ -59,7 +90,7 @@ New to the ESP32 WiFi Utility? Start here:
 - **Reboot Modal**: Countdown timer for controlled device restarts
 - **Quick References**: Command cheat sheets for rapid configuration
 
-### 🆕 v4.0.0: Interactive Network Details & Multi-Platform Web Server
+### v4.0.0: Interactive Network Details & Multi-Platform Web Server
 - **Clickable Network Details**: Click any scanned network to view comprehensive information
   - 8-level signal quality scale with visual indicators
   - Channel congestion analysis (Clear to Severe ratings)
@@ -104,16 +135,21 @@ New to the ESP32 WiFi Utility? Start here:
 ```
 docs/
 ├── README.md                           # This index file
-├── RELEASE_NOTES_V4.2.0.md            # 🆕 v4.2.0 release notes
-├── WEB_CONFIGURATION.md                # 🆕 v4.2.0 web config guide
-├── CONFIGURATION_SYSTEM.md             # 🆕 v4.2.0 configuration overview
-├── AP_CONFIG_PERSISTENCE.md            # 🆕 v4.2.0 AP configuration
-├── STATION_CONFIG_PERSISTENCE.md       # 🆕 v4.2.0 Station configuration
-├── AP_CONFIG_QUICK_REF.md             # 🆕 v4.2.0 AP commands
-├── STATION_CONFIG_QUICK_REF.md        # 🆕 v4.2.0 Station commands
-├── RESPONSIVE_MENU.md                  # 🆕 v4.2.0 mobile menu
-├── MIGRATION_GUIDE_V4.2.0.md          # 🆕 v4.2.0 upgrade guide
-├── IMPROVEMENTS_SUMMARY.md             # 🆕 v4.2.0 improvements
+├── DOCUMENTATION_INDEX.md              # Complete documentation catalog
+├── RELEASE_NOTES_V5.0.0.md            # 🆕 Latest release notes
+├── RELEASE_NOTES_V4.3.1.md            # v4.3.1 release notes
+├── WEB_CONFIGURATION.md                # Web-based configuration guide
+├── CONFIGURATION_SYSTEM.md             # Configuration overview
+├── PORT_SCANNER.md                     # 🆕 v4.3.0 Port scanning guide
+├── SIGNAL_STRENGTH_MONITOR.md         # 🆕 v4.3.0 Signal monitor guide
+├── CHANNEL_GRAPH.md                    # 🆕 v4.3.0 Channel graph guide
+├── AP_CONFIG_PERSISTENCE.md            # AP configuration details
+├── STATION_CONFIG_PERSISTENCE.md       # Station configuration details
+├── AP_CONFIG_QUICK_REF.md             # AP commands cheat sheet
+├── STATION_CONFIG_QUICK_REF.md        # Station commands cheat sheet
+├── RESPONSIVE_MENU.md                  # Mobile menu guide
+├── LIBRARY_STRUCTURE.md                # Modular architecture
+├── IMPROVEMENTS_SUMMARY.md             # Feature improvements
 ├── user-guides/                        # End-user documentation
 │   ├── CHANNEL_GUIDE.md               # Channel analysis user guide
 │   ├── LATENCY_GUIDE.md               # Latency testing guide
@@ -122,11 +158,19 @@ docs/
 │   ├── WEB_INTERFACE.md               # Web dashboard documentation
 │   └── NEOPIXEL_GUIDE.md              # NeoPixel LED guide (Feather only)
 └── technical/                          # Developer documentation
-    ├── CODE_IMPROVEMENTS_V4.2.0.md    # 🆕 v4.2.0 technical changes
-    ├── CHANNEL_IMPLEMENTATION.md      # Algorithm implementation
-    ├── TEST_INFRASTRUCTURE.md         # Testing framework
-    ├── IMPLEMENTATION_SUMMARY.md      # Architecture overview
-    └── PROJECT_COMPLETION_SUMMARY.md  # Project achievements
+    ├── WIFI_TASK_ARCHITECTURE.md      # 🆕 WiFi command task
+    ├── TFT_TASK_ARCHITECTURE.md       # 🆕 TFT display task
+    ├── RTOS_ARCHITECTURE.md            # RTOS system overview
+    ├── RTOS_API_REFERENCE.md           # Task and queue APIs
+    ├── RTOS_TUTORIAL_NEW_TASK.md      # Tutorial: Creating tasks
+    ├── RTOS_TUTORIAL_QUEUES.md        # Tutorial: Queue messaging
+    ├── RTOS_TUTORIAL_DEBUGGING.md     # Tutorial: Debugging tasks
+    ├── CHANNEL_IMPLEMENTATION.md       # Algorithm implementation
+    ├── TEST_INFRASTRUCTURE.md          # Testing framework
+    ├── IMPLEMENTATION_SUMMARY.md       # Architecture overview
+    ├── PROJECT_COMPLETION_SUMMARY.md   # Project achievements
+    ├── AUTOMATED_RELEASES.md           # CI/CD pipeline
+    └── WORKFLOW_SUMMARY.md             # Release automation
 ```
 
 ## 🌐 Quick Access - v4.2.0 Features