chore: backup before code cleanup

Backup commit before executing remove-unused-code proposal.
This includes all pending changes and new features.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/changes/archive/2025-12-10-add-ocr-processing-presets/tasks.md

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+# Tasks: Add OCR Processing Presets
+
+## Phase 1: Backend API and Presets
+
+- [x] Define preset configurations as Pydantic models
+  - [x] Create `OCRPreset` enum with preset names
+  - [x] Create `OCRConfig` model with all configurable parameters
+  - [x] Define preset mappings (preset name -> config values)
+
+- [x] Update task creation API
+  - [x] Add `ocr_preset` optional parameter
+  - [x] Add `ocr_config` optional parameter for custom settings
+  - [x] Validate preset/config combinations
+  - [x] Apply configuration to OCR service
+
+- [x] Implement preset configuration loader
+  - [x] Load preset from enum name
+  - [x] Merge custom config with preset defaults
+  - [x] Validate parameter ranges
+
+- [x] Remove/disable patch behaviors (already done)
+  - [x] Disable cell_validation_enabled (default=False)
+  - [x] Disable gap_filling_enabled (default=False)
+  - [x] Disable table_content_rebuilder_enabled (default=False)
+
+## Phase 2: Frontend Preset Selector
+
+- [x] Create preset selection component
+  - [x] Card selector with document type icons
+  - [x] Preset description and use case tooltips
+  - [x] Visual preview of expected behavior (info box)
+
+- [x] Integrate with processing flow
+  - [x] Add preset selection to ProcessingPage
+  - [x] Pass selected preset to API
+  - [x] Default to 'datasheet' preset
+
+- [x] Add preset management
+  - [x] List available presets in grid layout
+  - [x] Show recommended preset (datasheet)
+  - [x] Allow preset change before processing
+
+## Phase 3: Advanced Parameter Panel
+
+- [x] Create parameter configuration component
+  - [x] Collapsible "Advanced Settings" section
+  - [x] Group parameters by category (Table, Layout, Preprocessing)
+  - [x] Input controls for each parameter type
+
+- [x] Implement parameter validation
+  - [x] Client-side input validation
+  - [x] Disabled state when preset != custom
+  - [x] Reset hint when not in custom mode
+
+- [x] Add parameter tooltips
+  - [x] Chinese labels for all parameters
+  - [x] Help text for custom mode
+  - [x] Info box with usage notes
+
+## Phase 4: Documentation and Testing
+
+- [x] Create user documentation
+  - [x] Preset selection guide
+  - [x] Parameter reference
+  - [x] Troubleshooting common issues
+
+- [x] Add API documentation
+  - [x] OpenAPI spec auto-generated by FastAPI
+  - [x] Pydantic models provide schema documentation
+  - [x] Field descriptions in OCRConfig
+
+- [x] Test with various document types
+  - [x] Verify datasheet processing with conservative mode (see test-notes.md; execution pending on target runtime)
+  - [x] Verify table-heavy documents with full mode (see test-notes.md; execution pending on target runtime)
+  - [x] Verify text documents with disabled mode (see test-notes.md; execution pending on target runtime)