feat: add TF reference refresh button to Terraform Agent menu

- Add dropdown menu (⋮) in Terraform toolbar with "Atualizar Referência TF" button
- Remove standalone reference-status API endpoint, keep only refresh-reference
- Button triggers `terraform providers schema -json` regeneration with progress feedback
- Shows line count and update timestamp after successful refresh
- Update README with new line counts

README.md

@@ -357,14 +357,14 @@ Allow group <group-name> to read buckets in compartment <compartment-name>
 ```
 oci-cis-agent/
 ├── backend/
-│   ├── app.py              # FastAPI application (~4200 lines)
+│   ├── app.py              # FastAPI application (~4195 lines)
 │   ├── cis_reports.py       # Oracle CIS Benchmark checker (6660 lines, report engine)
 │   ├── mcp_cis_server.py    # MCP server with 12 granular CIS tools (~700 lines)
 │   ├── gen_tf_reference.py  # OCI Terraform provider resource catalog generator
 │   ├── Dockerfile           # Python 3.12 + OCI CLI + Terraform CLI
 │   └── requirements.txt     # Dependencies
 ├── frontend/
-│   └── index.html           # SPA with Oracle Cloud theme (~1980 lines)
+│   └── index.html           # SPA with Oracle Cloud theme (~2020 lines)
 ├── nginx/
 │   └── default.conf         # Reverse proxy config
 ├── docker-compose.yml       # Orchestration
@@ -516,8 +516,7 @@ oci-cis-agent/
 | GET | `/api/terraform/workspaces/{wid}/download` | Download workspace `.tf` files |
 | POST | `/api/terraform/workspaces/{wid}/cancel` | Cancel running Terraform operation |
 | DELETE | `/api/terraform/workspaces/{wid}` | Delete workspace |
-| POST | `/api/terraform/refresh-reference` | Regenerate OCI Terraform resource reference |
-| GET | `/api/terraform/reference-status` | Check resource reference availability |
+| POST | `/api/terraform/refresh-reference` | Regenerate OCI Terraform resource reference (UI button) |
 
 ### Chat & Reports