feat: enable document orientation detection for scanned PDFs
- Enable PP-StructureV3's use_doc_orientation_classify feature - Detect rotation angle from doc_preprocessor_res.angle - Swap page dimensions (width <-> height) for 90°/270° rotations - Output PDF now correctly displays landscape-scanned content Also includes: - Archive completed openspec proposals - Add simplify-frontend-ocr-config proposal (pending) - Code cleanup and frontend simplification 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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openspec/changes/simplify-frontend-ocr-config/proposal.md
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# Change: 簡化前端 OCR 配置選項
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## Why
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OCR track 已改為使用 simple OCR 模式,不再需要前端的複雜配置選項(如表格偵測模式、OCR 預設、進階參數等)。這些配置增加了使用者的認知負擔,且不再影響實際處理結果。
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## What Changes
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- **BREAKING** 移除前端的 OCR 處理預設選擇器 (`OCRPresetSelector`)
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- **BREAKING** 移除前端的表格偵測配置選擇器 (`TableDetectionSelector`)
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- **BREAKING** 移除前端相關的 TypeScript 類型定義 (`OCRPreset`, `OCRConfig`, `TableDetectionConfig`, `TableParsingMode` 等)
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- 保留版面模型選擇功能 (`LayoutModelSelector`): `chinese | default | cdla`
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- 保留影像前處理配置功能 (`PreprocessingSettings`): auto/manual/disabled 模式及相關參數
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- 簡化後端 API 的 `ProcessingOptions`,移除不再使用的參數
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## Impact
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- Affected specs: `ocr-processing`
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- Affected code:
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- **前端需刪除的檔案**:
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- `frontend/src/components/OCRPresetSelector.tsx`
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- `frontend/src/components/TableDetectionSelector.tsx`
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- **前端需修改的檔案**:
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- `frontend/src/types/apiV2.ts` - 移除未使用的類型定義
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- `frontend/src/pages/ProcessingPage.tsx` - 移除已註解的相關 import 和邏輯
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- **後端需修改的檔案**:
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- `backend/app/schemas/task.py` - 移除 `ProcessingOptions` 中的 `ocr_preset`, `ocr_config`, `table_detection` 欄位
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- `backend/app/routers/tasks.py` - 清理對應的參數處理邏輯
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