feat: wire structured logger (slog) throughout detection pipeline

[Kiran01bm]

What and Why ?

Address pending TODO related to structured logging - Replaces log.Printf calls with structured logging using Go's log/slog package. Adds logger fields to detector, inventory, and EOL provider components with consistent nil-safe defaults.

Changes

• Detectors: Add logger field to EKS and Aurora detectors
• Inventory: Add logger parameter to Wiz inventory sources (EKS, Aurora, ElastiCache) and parsing helpers
• EOL Provider: Add logger field to endoflife.date provider with warning logs for skipped cycles
• Main: Initialize JSON logger at startup and wire through all components
• Tests: Update all test constructors to pass nil logger (uses slog.Default())

Benefits

• Structured JSON logging for production observability
• Context-aware log messages with typed fields
• Consistent logging pattern across codebase
• All TODO comments for logging addressed

All tests pass ✅

[codecov]

Codecov Report

❌ Patch coverage is 52.94118% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/inventory/wiz/helpers.go	0.00%	4 Missing and 1 partial ⚠️
pkg/eol/endoflife/provider.go	50.00%	4 Missing ⚠️
pkg/inventory/wiz/eks.go	0.00%	4 Missing ⚠️
pkg/detector/eks/detector.go	50.00%	3 Missing ⚠️

Files with missing lines	Coverage Δ
pkg/detector/aurora/detector.go	84.90% <100.00%> (ø)
pkg/inventory/wiz/aurora.go	84.90% <100.00%> (ø)
pkg/inventory/wiz/elasticache.go	86.95% <100.00%> (ø)
pkg/detector/eks/detector.go	81.81% <50.00%> (ø)
pkg/eol/endoflife/provider.go	83.54% <50.00%> (ø)
pkg/inventory/wiz/eks.go	0.00% <0.00%> (ø)
pkg/inventory/wiz/helpers.go	75.22% <0.00%> (ø)

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