feat: refactor dual-track architecture (Phase 1-5)
## Backend Changes
- **Service Layer Refactoring**:
- Add ProcessingOrchestrator for unified document processing
- Add PDFTableRenderer for table rendering extraction
- Add PDFFontManager for font management with CJK support
- Add MemoryPolicyEngine (73% code reduction from MemoryGuard)
- **Bug Fixes**:
- Fix Direct Track table row span calculation
- Fix OCR Track image path handling
- Add cell_boxes coordinate validation
- Filter out small decorative images
- Add covering image detection
## Frontend Changes
- **State Management**:
- Add TaskStore for centralized task state management
- Add localStorage persistence for recent tasks
- Add processing state tracking
- **Type Consolidation**:
- Merge shared types from api.ts to apiV2.ts
- Update imports in authStore, uploadStore, ResultsTable, SettingsPage
- **Page Integration**:
- Integrate TaskStore in ProcessingPage and TaskDetailPage
- Update useTaskValidation hook with cache sync
## Testing
- Direct Track: edit.pdf (3 pages, 1.281s), edit3.pdf (2 pages, 0.203s)
- Cell boxes validation: 43 valid, 0 invalid
- Table merging: 12 merged cells verified
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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