- Add GET /operations endpoint with filtering by type, pagination, date range
- Join with inventory, employees, branches for rich display
- Add tbody IDs and footer/pagination IDs to operation tables in HTML
- Add loadOperations() JS function with renderOperationRow() per type
- Integrate loadOperations into switchTab for auto-load on tab change
- Update recordPurchase/Adjustment/Transfer to refresh respective lists
- Expose loadOperations globally for HTML inline script access