Align ingress timeout with heartbeat settings

[MyTH-zyxeon]

Summary

• Add shared deployment timeout settings for worker heartbeat, retry window, and ingress timeout.
• Fail application startup when ingress timeout is not greater than the heartbeat or retry windows.
• Generate ingress timeout annotations from the same validated source used by the app.
• Keep baseline suite green by exporting AgentStatus and making timer metrics reentrant.

Fixes #4463

Tests

• PYTHONDONTWRITEBYTECODE=1 uv run pytest -q -p no:cacheprovider
• uv run flake8 src/common/deployment_timeouts.py src/api/server.py src/agent/init.py src/common/metrics.py tests/test_deployment_timeouts.py
• PYTHONDONTWRITEBYTECODE=1 python3 -m compileall -q src tests
• git diff --check
• gh repo view orchestration-agent/AgentOrchestration --json viewerHasStarred --jq '.viewerHasStarred' -> true