chore(backend): update build configs and remove old services

- Makefile - update commands
- langgraph.json - update LangGraph configuration
- pyproject.toml - add new dependencies
- uv.lock - update lockfile
- Remove deprecated app/gateway/services.py

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/pyproject.toml

@@ -6,6 +6,7 @@ readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
     "deerflow-harness",
+    "deerflow-storage",
     "fastapi>=0.115.0",
     "httpx>=0.28.0",
     "python-multipart>=0.0.20",
@@ -20,6 +21,7 @@ dependencies = [
     "bcrypt>=4.0.0",
     "pyjwt>=2.9.0",
     "email-validator>=2.0.0",
+    "scalar-fastapi>=1.8.2",
 ]
 
 [project.optional-dependencies]