feat(ocr): Add modular store profiles with hot-reload support

## Store Profiles System
- Add ProfileRegistry for CUI-based profile lookup
- Add BaseStoreProfile with generic extraction patterns
- Implement hot-reload via POST /api/data-entry/ocr/profiles/reload

## 12 Store Profiles
- LIDL: Multi-rate TVA (A, B, C, D codes)
- OMV, SOCAR: B2B with client CUI, YYYY.MM.DD dates
- BRICK, DEDEMAN: Standard TVA, e-factura support
- KINETERRA, BEST PRINT: Non-VAT payers (returns [])
- STEPOUT MARKET: TVA 5% (books/reduced rate)
- UNLIMITED KEYS: NUMERAR payment detection
- GAMA INK, ELECTROBERING, PICTUS VELUM: Standard TVA

## Flexible TVA Patterns
- All patterns use (\d{1,2})% to accept any rate
- Supports historical (19%, 9%, 5%) and current (21%, 11%)

## Payment Methods Fix
- Fixed base.py to support multiple payments of same type
- Changed deduplication from method-only to (method, amount) tuple
- Returns separate entries for split payments

## Tools
- Add generate_store_profile.py for automatic profile generation
- Analyzes PDFs via OCR API and detects patterns

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

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

backend/modules/data_entry/routers/ocr.py

@@ -628,3 +628,86 @@ def _dict_to_extraction_data(data: dict) -> ExtractionData:
         validation_errors=data.get('validation_errors', []),
         inter_ocr_ratios=data.get('inter_ocr_ratios', {}),
     )
+
+
+# ============================================================================
+# Store Profiles Management Endpoints
+# ============================================================================
+
+@router.post("/profiles/reload")
+async def reload_store_profiles(
+    current_user: CurrentUser = Depends(get_current_user)
+) -> dict:
+    """
+    Hot-reload all store profiles.
+
+    Reloads profile Python modules without server restart.
+    Use after adding/modifying profile files.
+
+    Returns:
+        Dict with reloaded count and profile list
+    """
+    from backend.modules.data_entry.services.ocr.profiles import ProfileRegistry
+
+    count = ProfileRegistry.reload_all()
+    status = ProfileRegistry.get_reload_status()
+
+    return {
+        "success": True,
+        "reloaded_modules": count,
+        "profiles_count": status["profiles_count"],
+        "registered_cuis": status["registered_cuis"],
+        "last_reload": status["last_reload"],
+    }
+
+
+@router.get("/profiles")
+async def list_store_profiles(
+    current_user: CurrentUser = Depends(get_current_user)
+) -> dict:
+    """
+    List all registered store profiles.
+
+    Returns:
+        Dict with profiles list and status
+    """
+    from backend.modules.data_entry.services.ocr.profiles import ProfileRegistry
+
+    profiles = ProfileRegistry.list_profiles()
+    status = ProfileRegistry.get_reload_status()
+
+    return {
+        "profiles": profiles,
+        "count": len(profiles),
+        "last_reload": status["last_reload"],
+    }
+
+
+@router.get("/profiles/{cui}")
+async def get_store_profile(
+    cui: str,
+    current_user: CurrentUser = Depends(get_current_user)
+) -> dict:
+    """
+    Get details for a specific store profile.
+
+    Args:
+        cui: Store CUI (with or without RO prefix)
+
+    Returns:
+        Profile details including validation hints
+
+    Raises:
+        404: If no profile exists for this CUI
+    """
+    from backend.modules.data_entry.services.ocr.profiles import ProfileRegistry
+
+    info = ProfileRegistry.get_profile_info(cui)
+
+    if not info:
+        raise HTTPException(
+            status_code=404,
+            detail=f"No profile registered for CUI: {cui}"
+        )
+
+    return info