feat(confs): integrate dnfs service with centralized config management

- Add dnfs.ini to confs/configs/ with server, database, ai_review, confs sections
- Refactor dnfs.py to use three-layer fail-safe config loading (defaults → confs → env vars)
- Unify timeouts for DB RPC and AI review calls via configuration
- Add _merge_ini() whitelist merging to prevent unexpected config injection
- Environment variables have highest priority for Docker networking (db/ai_review hostnames)
- Document config loading mechanism in both confs/README.md and dnfs/README.md

Follows the same pattern as static service integration; confs failure falls back
gracefully to built-in defaults + environment variables.
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@@ -196,15 +196,41 @@ curl -X POST http://localhost:8006/update_note \
## 配置
服务地址与上游依赖硬编码在 [dnfs.py](dnfs.py):
dnfs 已接入 confs 统一配置服务,采用**三层 fail-safe** 加载模式(与 static 服务一致):
| 常量 | 值 | 说明 |
|------|----|------|
| `ADDR` / `PORT` | `127.0.0.1` / `8006` | 监听地址 |
| `DB_SERVER_URL` | `http://127.0.0.1:8005/execute` | db 服务 |
| `REVIEW_SERVER_URL` | `http://127.0.0.1:8007/review` | ai_review 服务 |
**加载顺序**:内置默认值 → confs 统一配置服务(dnfs.ini,优先)→ 环境变量覆盖(最高优先级)
调用超时均为 10 秒。
### 配置文件
集中托管在 [confs/configs/dnfs.ini](../confs/configs/dnfs.ini),由 confs 服务分发:
| Section | Key | 默认值 | 说明 |
|---------|-----|--------|------|
| `[server]` | `host` | `127.0.0.1` | 监听地址 |
| `[server]` | `port` | `8006` | 监听端口 |
| `[database]` | `host` | `127.0.0.1` | db 服务地址 |
| `[database]` | `port` | `8005` | db 服务端口 |
| `[database]` | `timeout` | `10` | RPC 调用超时(秒) |
| `[ai_review]` | `url` | `http://127.0.0.1:8007/review` | AI 审核接口地址 |
| `[ai_review]` | `timeout` | `10` | AI 审核请求超时(秒) |
| `[confs]` | `host` | `127.0.0.1` | confs 服务地址 |
| `[confs]` | `port` | `8010` | confs 服务端口 |
### 环境变量(Docker 环境必需,优先级最高)
环境变量覆盖配置文件值,容器化部署时通过 docker-compose.yml 传入服务名:
| 变量 | 容器内值 | 说明 |
|------|---------|------|
| `LISTEN_ADDR` | `0.0.0.0` | 监听地址(容器内需绑定所有网卡) |
| `LISTEN_PORT` | `8006` | 监听端口 |
| `DB_HOST` | `db` | db 服务主机名(docker-compose 服务名) |
| `DB_PORT` | `8005` | db 服务端口 |
| `REVIEW_URL` | `http://ai_review:8007/review` | ai_review 服务地址 |
| `CONFS_HOST` | - | 可选,confs 容器化后使用 |
| `CONFS_PORT` | - | 可选,confs 容器化后使用 |
配置来源会记录到日志(`logs.info/warning`),便于排查实际用了哪一层。本地裸机运行时 confs 不可用会自动回退到内置默认值 + 环境变量。
## 前端