[优化] 代码优化

docs/en/reference/configuration.md

@@ -23,7 +23,6 @@ The Agent supports:
 | Component | Default Location | Description |
 | --- | --- | --- |
 | Server SQLite | `openflare.db` | Can be modified via `SQLITE_PATH` |
-| Server Uploads Directory | `upload` | Can be modified via `UPLOAD_PATH` |
 | Agent Configuration File | `./agent.json` | Can be specified via `-config` |
 | One-click Install Agent Config | `/opt/openflare-agent/agent.json` | Default generated by the installation script |
 | Agent Data Directory | `data` under the config directory | Can be modified via `data_dir` |
@@ -54,7 +53,6 @@ go run . --port 3000 --log-dir ./logs
 | `DSN` | PostgreSQL DSN, preferred over SQLite when set | empty |
 | `SQL_DSN` | Legacy PostgreSQL DSN, lower priority than `DSN` | empty |
 | `REDIS_CONN_STRING` | Redis connection string | empty |
-| `UPLOAD_PATH` | Upload directory | `upload` |
 | `AGENT_TOKEN` | Legacy global Agent token | empty |
 
 Description: