[1.0] Wire CLI serve to the standard server components

The CLI serve path constructs BaseHTTPService without components, so configuration exposes only FastAPI documentation routes instead of the normal application API.

Scope

• Reuse the existing standard server composition from the CLI path.
• Keep established configuration, lifecycle and shutdown behavior rather than introducing a second server stack.
• Give a meaningful startup error when the configured service cannot be assembled.

Acceptance criteria

• A deterministic CLI/server smoke check exposes the expected application API routes rather than only /docs and /openapi.json.
• The configured prefix and applicable authentication settings reach the actual server.
• Startup and shutdown finish cleanly without requiring a model API key.

Boundaries

Loading a user's application factory and the full onboarding example are a dependent slice.

References

• src/flock/cli.py
• src/flock/api/base_service.py
• src/flock/orchestrator/server_manager.py

Start by comparing the CLI serve path in src/flock/cli.py with the standard composition in src/flock/orchestrator/server_manager.py and the service behavior in src/flock/api/base_service.py. Run a deterministic CLI/server smoke check, then verify that application routes, the configured prefix, applicable authentication, and clean startup and shutdown work without a model API key.