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>

backend/app/schemas/task.py

@@ -65,139 +65,6 @@ class PreprocessingContrastEnum(str, Enum):
     DOCUMENT = "document"
 
 
-class OCRPresetEnum(str, Enum):
-    """OCR processing preset for different document types.
-
-    Presets provide optimized PP-Structure configurations for common document types:
-    - TEXT_HEAVY: Reports, articles, manuals (disable table recognition)
-    - DATASHEET: Technical datasheets, TDS (conservative table parsing)
-    - TABLE_HEAVY: Financial reports, spreadsheets (full table recognition)
-    - FORM: Applications, surveys (conservative table parsing)
-    - MIXED: General documents (classification only)
-    - CUSTOM: User-defined settings (use ocr_config)
-    """
-    TEXT_HEAVY = "text_heavy"       # Reports, articles, manuals
-    DATASHEET = "datasheet"         # Technical datasheets, TDS
-    TABLE_HEAVY = "table_heavy"     # Financial reports, spreadsheets
-    FORM = "form"                   # Applications, surveys
-    MIXED = "mixed"                 # General documents
-    CUSTOM = "custom"               # User-defined settings
-
-
-class TableParsingModeEnum(str, Enum):
-    """Table parsing mode controlling how aggressively tables are parsed.
-
-    - FULL: Full table recognition with cell segmentation (aggressive)
-    - CONSERVATIVE: Disable wireless tables to prevent cell explosion
-    - CLASSIFICATION_ONLY: Only classify table regions, no cell segmentation
-    - DISABLED: Completely disable table recognition
-    """
-    FULL = "full"
-    CONSERVATIVE = "conservative"
-    CLASSIFICATION_ONLY = "classification_only"
-    DISABLED = "disabled"
-
-
-class OCRConfig(BaseModel):
-    """OCR processing configuration for PP-Structure.
-
-    Allows fine-grained control over PP-Structure parameters.
-    Use with ocr_preset=CUSTOM or to override specific preset values.
-    """
-    # Table Processing
-    table_parsing_mode: TableParsingModeEnum = Field(
-        default=TableParsingModeEnum.CONSERVATIVE,
-        description="Table parsing mode: full, conservative, classification_only, disabled"
-    )
-    enable_wired_table: bool = Field(
-        default=True,
-        description="Enable wired (bordered) table detection"
-    )
-    enable_wireless_table: bool = Field(
-        default=False,
-        description="Enable wireless (borderless) table detection. Can cause cell explosion."
-    )
-
-    # Layout Detection
-    layout_threshold: Optional[float] = Field(
-        default=None,
-        ge=0.0,
-        le=1.0,
-        description="Layout detection threshold. Higher = stricter. None uses default."
-    )
-    layout_nms_threshold: Optional[float] = Field(
-        default=None,
-        ge=0.0,
-        le=1.0,
-        description="Layout NMS threshold. None uses default."
-    )
-
-    # Preprocessing
-    use_doc_orientation_classify: bool = Field(
-        default=True,
-        description="Auto-detect and correct document rotation"
-    )
-    use_doc_unwarping: bool = Field(
-        default=False,
-        description="Correct document warping. Can cause distortion."
-    )
-    use_textline_orientation: bool = Field(
-        default=True,
-        description="Detect textline orientation"
-    )
-
-    # Recognition Modules
-    enable_chart_recognition: bool = Field(
-        default=True,
-        description="Enable chart/diagram recognition"
-    )
-    enable_formula_recognition: bool = Field(
-        default=True,
-        description="Enable math formula recognition"
-    )
-    enable_seal_recognition: bool = Field(
-        default=False,
-        description="Enable seal/stamp recognition"
-    )
-    enable_region_detection: bool = Field(
-        default=True,
-        description="Enable region detection for better structure"
-    )
-
-
-# Preset configurations mapping
-OCR_PRESET_CONFIGS = {
-    OCRPresetEnum.TEXT_HEAVY: OCRConfig(
-        table_parsing_mode=TableParsingModeEnum.DISABLED,
-        enable_wired_table=False,
-        enable_wireless_table=False,
-        enable_chart_recognition=False,
-        enable_formula_recognition=False,
-    ),
-    OCRPresetEnum.DATASHEET: OCRConfig(
-        table_parsing_mode=TableParsingModeEnum.CONSERVATIVE,
-        enable_wired_table=True,
-        enable_wireless_table=False,
-    ),
-    OCRPresetEnum.TABLE_HEAVY: OCRConfig(
-        table_parsing_mode=TableParsingModeEnum.FULL,
-        enable_wired_table=True,
-        enable_wireless_table=True,
-    ),
-    OCRPresetEnum.FORM: OCRConfig(
-        table_parsing_mode=TableParsingModeEnum.CONSERVATIVE,
-        enable_wired_table=True,
-        enable_wireless_table=False,
-    ),
-    OCRPresetEnum.MIXED: OCRConfig(
-        table_parsing_mode=TableParsingModeEnum.CLASSIFICATION_ONLY,
-        enable_wired_table=True,
-        enable_wireless_table=False,
-    ),
-    # CUSTOM uses user-provided config directly
-}
-
-
 class PreprocessingConfig(BaseModel):
     """Preprocessing configuration for layout detection enhancement.
 
@@ -235,31 +102,6 @@ class PreprocessingConfig(BaseModel):
     )
 
 
-class TableDetectionConfig(BaseModel):
-    """Table detection configuration for PP-StructureV3.
-
-    Controls which table detection modes to enable. PP-StructureV3 uses specialized
-    models for different table types:
-    - Wired (bordered): Tables with visible cell borders/grid lines
-    - Wireless (borderless): Tables without visible borders, relying on alignment
-    - Region detection: Detect table-like regions for better cell structure
-
-    Multiple options can be enabled simultaneously for comprehensive detection.
-    """
-    enable_wired_table: bool = Field(
-        default=True,
-        description="Enable wired (bordered) table detection. Best for tables with visible grid lines."
-    )
-    enable_wireless_table: bool = Field(
-        default=True,
-        description="Enable wireless (borderless) table detection. Best for tables without visible borders."
-    )
-    enable_region_detection: bool = Field(
-        default=True,
-        description="Enable region detection for better table structure inference."
-    )
-
-
 class ImageQualityMetrics(BaseModel):
     """Image quality metrics from auto-analysis."""
     contrast: float = Field(..., description="Contrast level (std dev of grayscale)")
@@ -456,23 +298,6 @@ class ProcessingOptions(BaseModel):
         description="Manual preprocessing config (only used when preprocessing_mode='manual')"
     )
 
-    # Table detection configuration (OCR track only)
-    table_detection: Optional[TableDetectionConfig] = Field(
-        None,
-        description="Table detection config. If None, all table detection modes are enabled."
-    )
-
-    # OCR Processing Preset (OCR track only)
-    # Use presets for optimized configurations or CUSTOM with ocr_config for fine-tuning
-    ocr_preset: Optional[OCRPresetEnum] = Field(
-        default=OCRPresetEnum.DATASHEET,
-        description="OCR processing preset: text_heavy, datasheet, table_heavy, form, mixed, custom"
-    )
-    ocr_config: Optional[OCRConfig] = Field(
-        None,
-        description="Custom OCR config. Used when ocr_preset=custom or to override preset values."
-    )
-
 
 class AnalyzeRequest(BaseModel):
     """Document analysis request"""