Without the type annotation, FastAPI treats `request` as a Query
parameter and bubbles it up to every endpoint that uses
`Depends(get_current_user_id)`. Result: POST /api/compile/start
and POST /api/compile/ both returned 422
{"loc":["query","request"],"msg":"Field required"} on every call
the frontend made — compile was fully broken in production.
The frontend then caught the 422 axios error and surfaced
response.data as a CompileResult, which had no success/stdout/
stderr/error fields, so the editor's CompilationConsole rendered
only the fallback "✕ Compilation failed" line with no detail.
Annotating `request: Request` is the standard FastAPI pattern;
the framework injects the raw HTTPRequest and no longer treats
it as a query parameter.
1190cc1c35