feat(auth): authentication module with multi-tenant isolation (RFC-001)

Introduce an always-on auth layer with auto-created admin on first boot,
multi-tenant isolation for threads/stores, and a full setup/login flow.

Backend
- JWT access tokens with `ver` field for stale-token rejection; bump on
  password/email change
- Password hashing, HttpOnly+Secure cookies (Secure derived from request
  scheme at runtime)
- CSRF middleware covering both REST and LangGraph routes
- IP-based login rate limiting (5 attempts / 5-min lockout) with bounded
  dict growth and X-Forwarded-For bypass fix
- Multi-worker-safe admin auto-creation (single DB write, WAL once)
- needs_setup + token_version on User model; SQLite schema migration
- Thread/store isolation by owner; orphan thread migration on first admin
  registration
- thread_id validated as UUID to prevent log injection
- CLI tool to reset admin password
- Decorator-based authz module extracted from auth core

Frontend
- Login and setup pages with SSR guard for needs_setup flow
- Account settings page (change password / email)
- AuthProvider + route guards; skips redirect when no users registered
- i18n (en-US / zh-CN) for auth surfaces
- Typed auth API client; parseAuthError unwraps FastAPI detail envelope

Infra & tooling
- Unified `serve.sh` with gateway mode + auto dep install
- Public PyPI uv.toml pin for CI compatibility
- Regenerated uv.lock with public index

Tests
- HTTP vs HTTPS cookie security tests
- Auth middleware, rate limiter, CSRF, setup flow coverage

docker/docker-compose-dev.yaml

@@ -19,8 +19,6 @@ services:
   # cluster via the K8s API.
   # Backend accesses sandboxes directly via host.docker.internal:{NodePort}.
   provisioner:
-    profiles:
-      - provisioner
     build:
       context: ./provisioner
       dockerfile: Dockerfile
@@ -59,20 +57,25 @@ services:
 
   # ── Reverse Proxy ──────────────────────────────────────────────────────
   # Routes API traffic to gateway/langgraph and (optionally) provisioner.
-  # Select nginx config via NGINX_CONF:
-  # - nginx.local.conf (default): no provisioner route (local/aio modes)
-  # - nginx.conf: includes provisioner route (provisioner mode)
+  # LANGGRAPH_UPSTREAM and LANGGRAPH_REWRITE control gateway vs standard
+  # routing (processed by envsubst at container start).
   nginx:
     image: nginx:alpine
     container_name: deer-flow-nginx
     ports:
       - "2026:2026"
     volumes:
-      - ./nginx/${NGINX_CONF:-nginx.conf}:/etc/nginx/nginx.conf:ro
+      - ./nginx/nginx.conf:/etc/nginx/nginx.conf.template:ro
+    environment:
+      - LANGGRAPH_UPSTREAM=${LANGGRAPH_UPSTREAM:-langgraph:2024}
+      - LANGGRAPH_REWRITE=${LANGGRAPH_REWRITE:-/}
+    command: >
+      sh -c "envsubst '$$LANGGRAPH_UPSTREAM $$LANGGRAPH_REWRITE'
+      < /etc/nginx/nginx.conf.template > /etc/nginx/nginx.conf
+      && nginx -g 'daemon off;'"
     depends_on:
       - frontend
       - gateway
-      - langgraph
     networks:
       - deer-flow-dev
     restart: unless-stopped
@@ -102,6 +105,7 @@ services:
       - CI=true
       - DEER_FLOW_INTERNAL_GATEWAY_BASE_URL=http://gateway:8001
       - DEER_FLOW_INTERNAL_LANGGRAPH_BASE_URL=http://langgraph:2024
+      - NEXT_PUBLIC_LANGGRAPH_BASE_URL=${NEXT_PUBLIC_LANGGRAPH_BASE_URL:-}
     env_file:
       - ../frontend/.env
     networks:
@@ -113,6 +117,7 @@ services:
     build:
       context: ../
       dockerfile: backend/Dockerfile
+      target: dev
       # cache_from disabled - requires manual setup: mkdir -p /tmp/docker-cache-gateway
       args:
         APT_MIRROR: ${APT_MIRROR:-}
@@ -169,13 +174,14 @@ services:
     build:
       context: ../
       dockerfile: backend/Dockerfile
+      target: dev
       # cache_from disabled - requires manual setup: mkdir -p /tmp/docker-cache-langgraph
       args:
         APT_MIRROR: ${APT_MIRROR:-}
         UV_IMAGE: ${UV_IMAGE:-ghcr.io/astral-sh/uv:0.7.20}
         UV_INDEX_URL: ${UV_INDEX_URL:-https://pypi.org/simple}
     container_name: deer-flow-langgraph
-    command: sh -c "cd backend && uv sync && uv run langgraph dev --no-browser --allow-blocking --host 0.0.0.0 --port 2024 --n-jobs-per-worker 10 > /app/logs/langgraph.log 2>&1"
+    command: sh -c "cd backend && uv sync && allow_blocking='' && if [ \"\${LANGGRAPH_ALLOW_BLOCKING:-0}\" = '1' ]; then allow_blocking='--allow-blocking'; fi && uv run langgraph dev --no-browser \${allow_blocking} --host 0.0.0.0 --port 2024 --n-jobs-per-worker \${LANGGRAPH_JOBS_PER_WORKER:-10} > /app/logs/langgraph.log 2>&1"
     volumes:
       - ../backend/:/app/backend/
       # Preserve the .venv built during Docker image build — mounting the full backend/