feat(ai): temporal worker for lesson plan workflow

- deploy temporal server (postgresql + auto-setup + ui) in docker-compose
- new temporal/ module: workflow + activities + worker manager
- convert lesson plan 4-step orchestration to temporal workflow
- activities wrap existing analyze/recommend/generate/prepare_review steps
- worker injects failover_chain/content_client/data_ana_client via module globals
- start() uses temporal client.start_workflow, falls back to asyncio in dev
- register temporal ports 7233/8085 in port-allocation

Implements M6.5 of v2.1 migration plan (ADR-030).

infra/docker-compose.yml

@@ -346,6 +346,63 @@ services:
       interval: 15s
       timeout: 5s
       retries: 5
+  # ============================================================
+  # Temporal Server - AI 工作流引擎（v2.1 §8.2 ADR-030）
+  # 仅用于 AI 耗时工作流 + Saga，CRUD 短事务禁止
+  # ============================================================
+  temporal-postgresql:
+    image: docker.m.daocloud.io/library/postgres:13
+    container_name: edu-temporal-postgres
+    profiles: ["p3", "p4", "p5", "p6"]
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: temporal
+      POSTGRES_PASSWORD: ${TEMPORAL_POSTGRES_PASSWORD:-temporal}
+      POSTGRES_DB: temporal
+    volumes:
+      - temporal_pg_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U temporal"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+  temporal:
+    image: temporalio/auto-setup:1.23
+    container_name: edu-temporal
+    profiles: ["p3", "p4", "p5", "p6"]
+    restart: unless-stopped
+    depends_on:
+      temporal-postgresql:
+        condition: service_healthy
+    environment:
+      DBHOST: temporal-postgresql
+      DBPORT: 5432
+      DBUSER: temporal
+      DBPASSWORD: ${TEMPORAL_POSTGRES_PASSWORD:-temporal}
+      DBNAME: temporal
+      DB_PLUGIN: postgres
+      # 暴露 frontend gRPC 端口 7233 供 Worker 连接
+      SERVICES: "frontend,history,matching,worker"
+    ports:
+      - "7233:7233"
+    healthcheck:
+      test: ["CMD", "tctl", "--address", "localhost:7233", "cluster", "health"]
+      interval: 15s
+      timeout: 5s
+      start_period: 30s
+      retries: 10
+  temporal-ui:
+    image: temporalio/ui:2.30.0
+    container_name: edu-temporal-ui
+    profiles: ["p3", "p4", "p5", "p6"]
+    restart: unless-stopped
+    depends_on:
+      - temporal
+    environment:
+      TEMPORAL_ADDRESS: temporal:7233
+      TEMPORAL_CORS_ORIGINS: "http://localhost:4000,http://localhost:4001,http://localhost:4002,http://localhost:4003"
+    ports:
+      - "8085:8080"
 volumes:
   mysql_data:
   redis_data:
@@ -356,3 +413,4 @@ volumes:
   prometheus_data:
   alertmanager_data:
   loki_data:
+  temporal_pg_data: