feat(loyalty): transaction categories (what was sold)

Merchants can configure per-store product categories (e.g., Men,
Women, Accessories, Kids) that sellers select when entering loyalty
transactions. Enables per-category sales analytics.

Backend:
- New model: StoreTransactionCategory (store-scoped, max 10 per store)
- Migration loyalty_007: creates table + adds category_id FK on
  loyalty_transactions
- New category_service.py with CRUD + validation
- New schemas/category.py (Create, Update, Response, ListResponse)
- Admin CRUD: GET/POST/PATCH/DELETE /admin/loyalty/stores/{id}/categories
- Store CRUD: GET/POST/PATCH/DELETE /store/loyalty/categories
- Stamp/Points request schemas accept optional category_id
- Stamp/Points services pass category_id to transaction creation
- TransactionResponse includes category_id + category_name

342 tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/loyalty/schemas/card.py

@@ -188,6 +188,8 @@ class TransactionResponse(BaseModel):
     order_reference: str | None = None
     reward_id: str | None = None
     reward_description: str | None = None
+    category_id: int | None = None
+    category_name: str | None = None
     notes: str | None = None
 
     # Customer

app/modules/loyalty/schemas/category.py

@@ -0,0 +1,42 @@
+# app/modules/loyalty/schemas/category.py
+"""Pydantic schemas for transaction categories."""
+
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class CategoryCreate(BaseModel):
+    """Schema for creating a transaction category."""
+
+    name: str = Field(..., min_length=1, max_length=100)
+    display_order: int = Field(default=0, ge=0)
+
+
+class CategoryUpdate(BaseModel):
+    """Schema for updating a transaction category."""
+
+    name: str | None = Field(None, min_length=1, max_length=100)
+    display_order: int | None = Field(None, ge=0)
+    is_active: bool | None = None
+
+
+class CategoryResponse(BaseModel):
+    """Schema for transaction category response."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    store_id: int
+    name: str
+    display_order: int
+    is_active: bool
+    created_at: datetime
+    updated_at: datetime
+
+
+class CategoryListResponse(BaseModel):
+    """Schema for listing categories."""
+
+    categories: list[CategoryResponse]
+    total: int

app/modules/loyalty/schemas/points.py

@@ -47,6 +47,12 @@ class PointsEarnRequest(BaseModel):
         description="Staff PIN for verification",
     )
 
+    # Category (what was sold)
+    category_id: int | None = Field(
+        None,
+        description="Transaction category ID (e.g., Men, Women, Accessories)",
+    )
+
     # Optional metadata
     notes: str | None = Field(
         None,

app/modules/loyalty/schemas/stamp.py

@@ -37,6 +37,12 @@ class StampRequest(BaseModel):
         description="Staff PIN for verification",
     )
 
+    # Category (what was sold)
+    category_id: int | None = Field(
+        None,
+        description="Transaction category ID (e.g., Men, Women, Accessories)",
+    )
+
     # Optional metadata
     notes: str | None = Field(
         None,