🐛 Bug Report: Synchronous function executions deadlock under concurrency — app/http.php never sets Swoole hook_flags

### 👟 Reproduction steps Self-hosted 2.0.0 (PostgreSQL). Any function that calls back into the Appwrite API — the normal server-function pattern — executed **synchronously** with a little concurrency: 1. Deploy a function that makes a few API calls back to Appwrite (e.g. `tablesDB.listRows`) using a server SDK and an API key. 2. Fire N synchronous executions at once: ```bash for i in $(seq 4); do curl -s -X POST "$ENDPOINT/v1/functions/$FN/executions" \ -H "X-Appwrite-Project: $PROJECT" -H "X-Appwrite-Key: $KEY" \ -H 'Content-Type: application/json' \ -d '{"body":"{}","async":false}' & done; wait ``` 3. With N as low as **4**, every execution fails at the SDK's client timeout. The same work run with `"async": true` always succeeds, because the functions worker runs those one at a time. ### 👍 Expected behavior Concurrent synchronous executions complete. A function calling back into the API should not be able to starve the server that is waiting for it. ### 👎 Actual behavior All concurrent executions hang until the calling SDK's timeout and then fail. The API log shows: ``` WARNING Server::timer_callback() (ERRNO 9007): No idle worker is available ``` Meanwhile the API answers *other* requests (pings, keyed row reads, even from inside the runtime container) in single-digit milliseconds, and no row-list request in the API's own log exceeds 100 ms. The requests never reach a worker. ### 🔗 Prior report This looks like the same failure as **#5629 "Appwrite main container freezes when executing cloud-functions"** (closed as completed), where the last comments report it still reproducing and the offered workaround is to run a *second* Appwrite API container and point function callbacks at it. That workaround is consistent with the analysis below: it works because the function's callbacks then land on a server whose workers are not the ones blocked waiting for the executor. The root cause below explains why, and needs no second container. ### 🎲 Root cause …