feat: Add API endpoint for managing categories

app/repositories/category_repository.py

@@ -0,0 +1,28 @@
+from typing import List, Optional
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+from app.db.models.category import Category
+
+
+class CategoryRepository:
+    def __init__(self, db: AsyncSession):
+        self.db = db
+
+    async def list_all(self) -> List[Category]:
+        """List all category records ordered alphabetically by name"""
+        query = select(Category).order_by(Category.name.asc())
+        result = await self.db.execute(query)
+        return list(result.scalars().all())
+
+    async def create(self, name: str) -> Category:
+        """Create a new category record"""
+        category = Category(name=name)
+        self.db.add(category)
+        await self.db.flush()
+        return category
+
+    async def get_by_name(self, name: str) -> Optional[Category]:
+        """Fetch a category record by name (case-insensitive)"""
+        query = select(Category).where(Category.name.ilike(name))
+        result = await self.db.execute(query)
+        return result.scalar_one_or_none()