docs(scanner): add comprehensive scanner restoration and enhancement plan
- Document missing 10 scanner endpoints lost during router refactor - Plan for library-type-aware scanner implementation - Application lifecycle management via App pattern - Background services auto-start (scheduler, watch mode) - Graceful shutdown with signal handling - Complete implementation guide with code snippets and testing checklist - Safe phased approach with rollback procedures Plan includes: - Phase 1: Create scanner routes file (internal/router/scanner.go) - Phase 2: Update router to capture EbookHandler - Phase 3: Implement library-type-aware scanning - Phase 4: Create application lifecycle management (internal/app/app.go) - Phase 5: Update main.go to use App pattern - Phase 6: Testing and verification Ready for implementation in next session.
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