fix: stabilize post-MVP travel-agent and itinerary workflows

.env.example

@@ -29,6 +29,9 @@ BACKEND_PORT=8016
 # Generate with: python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
 # FIELD_ENCRYPTION_KEY=replace_with_fernet_key
 
+# Optional: custom MCP HTTP endpoint path (default: api/mcp)
+# DJANGO_MCP_ENDPOINT=api/mcp
+
 # Optional: disable registration
 # https://adventurelog.app/docs/configuration/disable_registration.html
 DISABLE_REGISTRATION=False