Fixes MCP reconnect timeouts on tenant servers (Deck #302). Three changes:
- /health/ready now gates only on local config. Nextcloud/Qdrant health is
refreshed by a background loop, cached, and reported but NON-gating, so a
single-replica tenant Pod is no longer pulled from its Service on a transient
dependency blip (which dropped every MCP streamable-HTTP session and caused
reconnect timeouts). The probe path performs no external I/O.
- Refactor starlette_lifespan: collapse the four near-identical per-mode
task-group + session + yield + teardown skeletons into one shared task group
that also runs the readiness refresh loop; each mode contributes a
(start, teardown) pair. eviction_task_group is now always present.
- Migrate app.py off os.getenv: all config is read through dynaconf Settings
(adds health_ready_refresh_interval, oidc_token_type, oidc_scopes, port).
Inline/dynamic defaults preserved at each call site.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
