Category
GET /api/v1/category
Retrieve all categories (e.g., Food, Transport, Utilities).
POST /api/v1/category
Create a new category.
GET /api/v1/category/{id}
View a single category.
PUT /api/v1/category/{id}
Update a category entirely.
PATCH /api/v1/category/{id}
Partially update a category (e.g., rename it).
DELETE /api/v1/category/{id}
Delete a category.