Remove workers from L1 - causes cache inconsistency

With multiple workers, each process has its own in-memory cache index.
Files added by one worker aren't visible to others, causing intermittent
404 errors.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server.py

@@ -4014,4 +4014,6 @@ async def ui_run_partial(run_id: str, request: Request):
 
 if __name__ == "__main__":
     import uvicorn
-    uvicorn.run("server:app", host="0.0.0.0", port=8100, workers=4)
+    # Note: workers disabled because cache_manager uses in-memory state
+    # that isn't shared between worker processes
+    uvicorn.run("server:app", host="0.0.0.0", port=8100)