## REMOVED Requirements

### Requirement: Legacy OCR Service Implementation

**Reason**: `ocr_service_original.py` was the original OCR service implementation that has been completely superseded by the current `ocr_service.py`. The legacy file is no longer referenced by any part of the codebase.

**Migration**: No migration needed. The current `ocr_service.py` provides all required functionality with improved architecture.

#### Scenario: Legacy service file removal
- **WHEN** the legacy `ocr_service_original.py` file is removed
- **THEN** the system continues to function normally using `ocr_service.py`
- **AND** no import errors occur in any service or router

### Requirement: Unused Preprocessor Service

**Reason**: `preprocessor.py` was a document preprocessor that is no longer used. Its functionality has been absorbed by `layout_preprocessing_service.py`.

**Migration**: No migration needed. The preprocessing functionality is available through `layout_preprocessing_service.py`.

#### Scenario: Preprocessor file removal
- **WHEN** the unused `preprocessor.py` file is removed
- **THEN** the system continues to function normally
- **AND** layout preprocessing works correctly via `layout_preprocessing_service.py`

### Requirement: Unused PDF Font Manager

**Reason**: `pdf_font_manager.py` was intended for font management but is not referenced by `pdf_generator_service.py` or any other service.

**Migration**: No migration needed. Font handling is managed within `pdf_generator_service.py` directly.

#### Scenario: Font manager file removal
- **WHEN** the unused `pdf_font_manager.py` file is removed
- **THEN** PDF generation continues to work correctly
- **AND** fonts are rendered properly in generated PDFs

### Requirement: Legacy Frontend Components

**Reason**: `MarkdownPreview.tsx` and `ResultsTable.tsx` are frontend components that are not referenced by any page or component in the application.

**Migration**: No migration needed. `MarkdownPreview` functionality is not currently used. `ResultsTable` functionality has been replaced by `TaskHistoryPage`.

#### Scenario: Unused frontend component removal
- **WHEN** the unused `MarkdownPreview.tsx` and `ResultsTable.tsx` files are removed
- **THEN** the frontend application compiles successfully
- **AND** all pages render and function correctly

### Requirement: Legacy API Client Migration

**Reason**: `services/api.ts` and `types/api.ts` are legacy API client files with only 2 remaining references. These should be migrated to `apiV2` for consistency.

**Migration**:
1. Move `ExportRule` type to `types/apiV2.ts`
2. Add export rules API functions to `services/apiV2.ts`
3. Update `SettingsPage.tsx` and `Layout.tsx` to use apiV2
4. Remove legacy api.ts files

#### Scenario: Legacy API client removal after migration
- **WHEN** the legacy `api.ts` files are removed after migration
- **THEN** all API calls use the unified `apiV2` client
- **AND** `SettingsPage` export rules functionality works correctly
- **AND** `Layout` logout functionality works correctly
