docs: 更新环境配置示例文件和docker-compose配置

更新前后端环境配置示例文件，替换占位符为通用值
添加docker-compose示例文件
优化.gitignore文件，添加本地覆盖配置
统一各环境配置文件的格式和说明

docker-compose.yaml

@@ -7,9 +7,9 @@ services:
     restart: always
     environment:
       TZ: "Asia/Shanghai"
-      MYSQL_ROOT_PASSWORD: "你的数据库密码"
+      MYSQL_ROOT_PASSWORD: "your_mysql_root_password"
       MYSQL_DATABASE: "fastapiadmin"
-      MYSQL_PASSWORD: "你的数据库密码"
+      MYSQL_PASSWORD: "your_mysql_password"
       MYSQL_USER: "fastapiadmin"
       MYSQL_TZINFO_TO_SYS_TABLES: 1 # 初始化MySQL时区表，解决时差问题
     ports:
@@ -24,7 +24,7 @@ services:
       - app_network
     # 健康检查：检测MySQL是否真正就绪，避免后端启动早于MySQL
     healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-p你的数据库密码"]
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-pyour_mysql_root_password"]
       interval: 5s                  # 每5秒检测一次
       timeout: 30s                  # 超时时间30秒
       retries: 10                   # 重试10次，失败则认为容器未就绪
@@ -42,7 +42,7 @@ services:
     volumes:
       # 挂载Redis配置文件，实现自定义配置
       - ./devops/redis/data:/data
-    command: redis-server --requirepass 你的Redis密码
+    command: redis-server --requirepass your_redis_password
     networks:
       - app_network
     
@@ -57,9 +57,9 @@ services:
     environment:
       TZ: "Asia/Shanghai"
       DATABASE_HOST: "mysql"
-      DATABASE_PASSWORD: "你的数据库密码"
+      DATABASE_PASSWORD: "your_mysql_password"
       REDIS_HOST: "redis"
-      REDIS_PASSWORD: "你的Redis密码"
+      REDIS_PASSWORD: "your_redis_password"
     ports:
       - "8001:8001"
     volumes: