Transaction CRUD API Endpoints

[olaysco]

Implement full CRUD operations for transactions.

Tasks:

• Create GET /api/transactions (list with pagination)
• Create POST /api/transactions (create new)
• Create PUT /api/transactions/<id> (update existing)
• Create DELETE /api/transactions/<id> (soft delete)
• Add filtering by date range and category
• Add input validation and error handling

Acceptance Criteria:

• All CRUD operations work correctly
• Pagination works for large datasets
• Filtering by date and category works
• Only user's own transactions are accessible
• Proper error messages for invalid requests

Priority: High
Skills: REST APIs, Pagination, Filtering

[ARGS-PYH]

Currently on the sir @olaysco

[olaysco]

Noted @ARGS-PYH

[ARGS-PYH]

API endpoints Created