recipe: harden auth/metrics, add rate limiting and tests

gemini_proxy/app.py

@@ -25,7 +25,6 @@ async def recognize(
     image: Annotated[UploadFile, File(...)],
     prompt: Annotated[str, Form(...)],
     generation_config: Annotated[str, Form()] = "{}",
-    api_key_override: Annotated[str | None, Form()] = None,
 ) -> dict:
     if image.content_type not in ALLOWED_TYPES:
         raise HTTPException(status_code=415, detail="Unsupported image type")
@@ -34,7 +33,7 @@ async def recognize(
     if len(image_data) > MAX_IMAGE_BYTES:
         raise HTTPException(status_code=413, detail="Image is too large")
 
-    api_key = api_key_override or os.getenv("GEMINI_API_KEY")
+    api_key = os.getenv("GEMINI_API_KEY")
     if not api_key:
         raise HTTPException(status_code=503, detail="Gemini is not configured")