feat: Phase 1 — ReAct loop + Markdown rendering + Docker deployment

Backend:
- Enterprise Agent refactored from single-round to ReAct multi-turn loop
- New agent.ts (LLM decision node) + tool-executor.ts (tool execution + Gen-UI)
- tool-defs.ts extracted for shared tool schemas
- MAX_ITERATIONS=6 safeguard against infinite loops

Frontend:
- MessageBubble: Markdown + code highlighting + LaTeX + tables
- ThemeToggle: light/dark/system theme cycling
- chart-result Gen-UI card: recharts bar/line/pie/area charts

Infrastructure:
- Docker Compose (lightweight): only LangGraph + Frontend, Azure cloud for PG/Redis/Blob
- Dockerfiles for dev (hot reload) and prod
- Makefile with dev/prod/down/logs commands
- Updated CLAUDE.md and agent definitions for LangGraph.js architecture

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,110 @@
+# SOC Chat Clone - Local Docker (lightweight)
+# 基础设施用 Azure 云服务，本地只运行 LangGraph Server + Frontend
+#
+# Usage:
+#   make dev       - 开发模式（热重载）
+#   make prod      - 生产模式
+#   make down      - 停止
+
+services:
+  # ============================================================
+  # Backend - Development (hot reload, source mount)
+  # ============================================================
+
+  langgraph-dev:
+    container_name: soc-langgraph-dev
+    profiles: ["dev"]
+    build:
+      context: ./langgraph
+      dockerfile: Dockerfile.dev
+    env_file:
+      - ./langgraph/.env
+    ports:
+      - "2024:2024"
+    volumes:
+      - ./langgraph/src:/app/src:cached
+      - ./langgraph/langgraph.json:/app/langgraph.json:ro
+      - ./langgraph/index.html:/app/index.html:ro
+      - ./langgraph/vite.config.ts:/app/vite.config.ts:ro
+      - ./langgraph/tsconfig.json:/app/tsconfig.json:ro
+      - ./langgraph/tsconfig.app.json:/app/tsconfig.app.json:ro
+      - ./langgraph/tsconfig.node.json:/app/tsconfig.node.json:ro
+      - ./langgraph/tailwind.config.js:/app/tailwind.config.js:ro
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://localhost:2024/ok || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 15
+      start_period: 30s
+
+  # ============================================================
+  # Backend - Production (optimized image)
+  # ============================================================
+
+  langgraph-prod:
+    container_name: soc-langgraph-prod
+    profiles: ["prod"]
+    build:
+      context: ./langgraph
+      dockerfile: Dockerfile.prod
+    env_file:
+      - ./langgraph/.env
+    ports:
+      - "2024:2024"
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://localhost:2024/ok || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 15
+      start_period: 30s
+    restart: unless-stopped
+
+  # ============================================================
+  # Frontend - Development (Vite dev server with HMR)
+  # ============================================================
+
+  frontend-dev:
+    container_name: soc-frontend-dev
+    profiles: ["dev"]
+    build:
+      context: ./langgraph
+      dockerfile: Dockerfile.frontend.dev
+    environment:
+      - VITE_LANGGRAPH_URL=http://localhost:2024
+    ports:
+      - "5173:5173"
+    volumes:
+      - ./langgraph/src:/app/src:cached
+      - ./langgraph/index.html:/app/index.html:ro
+      - ./langgraph/vite.config.ts:/app/vite.config.ts:ro
+      - ./langgraph/tailwind.config.js:/app/tailwind.config.js:ro
+      - ./langgraph/tsconfig.json:/app/tsconfig.json:ro
+      - ./langgraph/tsconfig.app.json:/app/tsconfig.app.json:ro
+      - ./langgraph/tsconfig.node.json:/app/tsconfig.node.json:ro
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://localhost:5173 || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+      start_period: 15s
+
+  # ============================================================
+  # Frontend - Production (nginx + vite build)
+  # ============================================================
+
+  frontend-prod:
+    container_name: soc-frontend-prod
+    profiles: ["prod"]
+    build:
+      context: ./langgraph
+      dockerfile: Dockerfile.frontend.prod
+      args:
+        VITE_LANGGRAPH_URL: http://localhost:2024
+    ports:
+      - "3000:3000"
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://localhost:3000 || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped