Move ingress route audit reads to FastAPI

[cbusillo]

Summary

• move ingress route audit record list/read endpoints to native FastAPI
• delete the legacy WSGI read matcher/branch and keep direct fallback reads fail-closed
• add FastAPI behavior/OpenAPI/fallback-order coverage and update service boundary docs

Validation

• uv run python -m unittest tests.test_http_app.FastApiIngressRouteAuditReadTests tests.test_service.LaunchplaneServiceTests.test_ingress_route_audit_record_reads_are_retired_from_legacy_wsgi_app tests.test_service.LaunchplaneServiceTests.test_npmplus_ingress_route_apply_dry_run_returns_plan_without_mutation tests.test_service.LaunchplaneServiceTests.test_npmplus_ingress_route_apply_fails_before_mutation_when_audit_unavailable
• uv run --extra dev ruff check control_plane/http_app.py control_plane/service.py tests/test_http_app.py tests/test_service.py
• uv run --extra dev ruff format --check control_plane/http_app.py control_plane/service.py tests/test_http_app.py tests/test_service.py
• git diff --check
• uv run --extra dev ruff check .
• uv run --extra dev mypy control_plane tests
• uv run python -m unittest
• uv run /Users/cbusillo/Developer/codex-skills/jetbrains-inspection/scripts/jb-inspect.py closeout --repo /Users/cbusillo/Developer/launchplane --scope changed_files

Note: repo-wide Would reformat: control_plane/agent_context_service.py
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56 files would be reformatted, 328 files already formatted still reports pre-existing formatting drift in unrelated files; the changed Python files are formatted.