Resolve mirrored external automation runs by job id

[snivy-OwlLoft]

Summary

• resolve mirrored external automation runs by gateway job id when the plugin reports a synthetic automation id
• keep managed automation run ingestion unchanged while allowing external job mirrors to attach to the correct automation row
• add a FastAPI regression test covering external run ingestion via the state-report endpoint

Testing

• python3 -m py_compile clawbits/db/table_write.py tests/fastapi/test_automations.py

Notes

• Full pytest was not runnable in this checkout because the local Python test toolchain was not installed.