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/services/ocr/profiles/pictus_velum.py

@@ -0,0 +1,101 @@
+"""
+PICTUS VELUM SRL store profile for OCR extraction.
+
+Office supplies and stationery store.
+"""
+
+import re
+from decimal import Decimal, InvalidOperation
+from typing import List, Dict, Any
+
+from .base import BaseStoreProfile
+from . import ProfileRegistry
+
+
+@ProfileRegistry.register
+class PictusVelumProfile(BaseStoreProfile):
+    """
+    PICTUS VELUM SRL - standard TVA profile.
+
+    Key characteristics:
+    - Standard TVA format (single rate, any percentage)
+    - Office supplies and stationery (rechizite)
+    - CARD payment typical
+    """
+
+    CUI_LIST = ["39634534"]
+    NAME_PATTERNS = ["PICTUS", "PICTUS VELUM", "P1CTUS", "PICTUS VELUM SRL"]
+    STORE_NAME = "PICTUS VELUM SRL"
+
+    # Standard TVA patterns (flexible - accepts any rate)
+    TVA_PATTERNS = [
+        # "TVA A: XX% = YY,YY" or "TVA-A XX% YY,YY"
+        r'TVA\s*[-:]?\s*([A-D])\s*:?\s*(\d{1,2})\s*%\s*[=:]?\s*([\d.,]+)',
+        # "A - XX,XX% = YY,YY"
+        r'([A-D])\s*[-:]\s*(\d{1,2})[.,]?\d{0,2}\s*%\s*[=:]?\s*([\d.,]+)',
+        # "TVA XX% YY,YY" (simple format without code)
+        r'TVA\s+(\d{1,2})\s*%\s*([\d.,]+)',
+    ]
+
+    def extract_tva_entries(self, text: str) -> List[dict]:
+        """
+        Extract TVA entries from receipt text.
+
+        Args:
+            text: Raw OCR text from receipt
+
+        Returns:
+            List of TVA entries with code, percent, and amount
+        """
+        entries = []
+        seen = set()
+
+        # Try coded patterns first
+        for pattern in self.TVA_PATTERNS[:2]:
+            for match in re.finditer(pattern, text, re.IGNORECASE):
+                try:
+                    code = match.group(1).upper()
+                    percent = int(match.group(2))
+                    amount = self._parse_decimal(match.group(3))
+
+                    if amount and amount > 0:
+                        entry_key = (code, percent)
+                        if entry_key not in seen:
+                            entries.append({
+                                'code': code,
+                                'percent': percent,
+                                'amount': amount
+                            })
+                            seen.add(entry_key)
+                except (ValueError, InvalidOperation, IndexError):
+                    continue
+
+        # Fallback to simple format
+        if not entries:
+            simple_pattern = self.TVA_PATTERNS[2]
+            for match in re.finditer(simple_pattern, text, re.IGNORECASE):
+                try:
+                    percent = int(match.group(1))
+                    amount = self._parse_decimal(match.group(2))
+
+                    if amount and amount > 0:
+                        entries.append({
+                            'code': 'A',
+                            'percent': percent,
+                            'amount': amount
+                        })
+                        break
+                except (ValueError, InvalidOperation):
+                    continue
+
+        return entries
+
+    def get_validation_hints(self) -> Dict[str, Any]:
+        """Return PICTUS VELUM-specific validation hints."""
+        return {
+            "has_multi_rate_tva": False,
+            "card_equals_total": True,
+            "has_client_cui": False,
+            "has_efactura": False,
+            "is_non_vat_payer": False,
+        }