[WIP] Refactor massive addon structure for better maintainability

[Copilot]

Modularization Plan for Vision Assistant Pro Addon

Analysis

The main file __init__.py contains 3,778 lines with:

• 13 classes (dialogs, engines, handlers, settings)
• ~50+ top-level functions (prompts, utilities, media download, etc.)
• Multiple constants and configuration data
• All in a single monolithic file

Modularization Strategy

• Analyze current structure and create modularization plan
• Create new modular directory structure
• Extract constants and configuration to constants.py
• Extract OCR engines to ocr_engines.py
• Extract translation functionality to translator.py
• Extract Gemini API handler to gemini_handler.py
• Extract utility functions to utils.py
• Extract prompt management to prompt_manager.py
• Extract update functionality to updater.py
• Extract dialogs to separate files:
  • chat_dialog.py
  • settings_dialog.py
  • document_viewer_dialog.py
  • vision_qa_dialog.py
  • update_dialog.py
  • range_dialog.py
• Extract VirtualDocument class to virtual_document.py
• Update main __init__.py to import from modules
• Test the modularized addon
• Run linter and fix any issues
• Verify all functionality works correctly

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