chore(deploy): 本地部署脚本、容器配置与运行说明

PostgreSQL/pgvector 与 Redis 独立容器，后端、worker、前端可一键启停；不覆盖既有密钥。

deploy/local/compose.yaml

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+name: chattermate-local
+
+services:
+  db:
+    image: pgvector/pgvector:0.8.2-pg16
+    environment:
+      POSTGRES_DB: chattermate
+      POSTGRES_USER: chattermate
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Run ./deploy/local/local.sh init first}
+    ports:
+      - "127.0.0.1:15432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    command: ["postgres", "-c", "shared_buffers=64MB", "-c", "max_connections=80"]
+    mem_limit: 384m
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U chattermate -d chattermate"]
+      interval: 5s
+      timeout: 3s
+      retries: 20
+
+  redis:
+    image: redis:7.4
+    ports:
+      - "127.0.0.1:16380:6379"
+    volumes:
+      - redis_data:/data
+    command: ["redis-server", "--appendonly", "yes", "--maxmemory", "64mb", "--maxmemory-policy", "allkeys-lru"]
+    mem_limit: 96m
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 10
+
+volumes:
+  postgres_data:
+  redis_data: