refactor(api): remove MCP server integration and docs references

backend/tests/conftest.py

@@ -1,5 +1,4 @@
 import os
-from contextlib import asynccontextmanager
 
 # Must be set before importing db (which calls create_engine at module level)
 os.environ.setdefault("DATABASE_URL", "sqlite://")
@@ -14,18 +13,6 @@ from db import get_session
 from main import app
 
 
-@asynccontextmanager
-async def _db_only_lifespan(a):
-    """Lifespan without the MCP server for test isolation.
-
-    StreamableHTTPSessionManager.run() can only be called once per instance,
-    which conflicts with the per-test TestClient lifecycle. We replace the
-    combined (db + MCP) lifespan with one that only does DB setup.
-    """
-    db_module.create_db_and_tables()
-    yield
-
-
 @pytest.fixture()
 def session(monkeypatch):
     """Per-test fresh SQLite in-memory database with full isolation."""
@@ -47,9 +34,6 @@ def session(monkeypatch):
 @pytest.fixture()
 def client(session, monkeypatch):
     """TestClient using the per-test session for every request."""
-    # Replace combined (db+MCP) lifespan with DB-only to avoid the
-    # StreamableHTTPSessionManager single-run limitation.
-    monkeypatch.setattr(app.router, "lifespan_context", _db_only_lifespan)
 
     def _override():
         yield session