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

backend/app.py

@@ -3765,22 +3765,16 @@ async def tf_delete_workspace(wid: str, u=Depends(current_user)):
 
 @app.post("/api/terraform/refresh-reference")
 async def tf_refresh_reference(u=Depends(current_user)):
-    """Regenerate the OCI Terraform resource reference from provider schema."""
+    """Regenerate the OCI Terraform resource reference from provider schema (internal, triggered by UI button)."""
     loop = asyncio.get_event_loop()
     result = await loop.run_in_executor(_chat_executor, _regenerate_tf_reference)
-    return result
-
-
-@app.get("/api/terraform/reference-status")
-async def tf_reference_status(u=Depends(current_user)):
-    """Check if OCI Terraform resource reference is available."""
+    # Add status info
     p = Path(_TF_RESOURCE_REF_PATH)
     if p.exists():
         content = _load_tf_resource_reference()
-        lines = content.count('\n') if content else 0
-        mtime = datetime.fromtimestamp(p.stat().st_mtime).isoformat()
-        return {"available": True, "lines": lines, "updated_at": mtime}
-    return {"available": False}
+        result["lines"] = content.count('\n') if content else 0
+        result["updated_at"] = datetime.fromtimestamp(p.stat().st_mtime).strftime('%d/%m/%Y %H:%M')
+    return result
 
 
 def _write_tf_files(wdir: Path, tf_code: str):