feat(docker): 添加PostgreSQL初始化脚本并挂载到容器

在docker-compose.yml中添加postgres-init.sql挂载，用于容器启动时自动创建vector扩展

docker-compose.yml

@@ -8,6 +8,7 @@ services:
       POSTGRES_PASSWORD: postgres
     volumes:
       - postgres_data:/var/lib/postgresql/data
+      - ./postgres-init.sql:/docker-entrypoint-initdb.d/init.sql
     ports:
       - "5432:5432"
     healthcheck:

postgres-init.sql

@@ -0,0 +1 @@
+CREATE EXTENSION IF NOT EXISTS vector;