fix(lint): 修复 PR #14 引入的 lint 回退 (119→0)

PR #14 从旧分支复制文件导致回退了 PR #10 的 lint 修复。
修复内容:
- autoflake 移除未使用导入/变量
- autopep8 修复缩进/空格
- 手动修复 F821(pathlib→Path), F541(f-string), F841(未使用变量)
- 所有修复均通过 flake8 --max-line-length=120 --extend-ignore=E501 检查 (0 errors)

src/daemon/inbox.py

@@ -15,7 +15,6 @@ from __future__ import annotations
 import asyncio
 import json
 import logging
-import os
 from pathlib import Path
 from typing import Any, Callable, Coroutine, Dict, List, Optional
 
@@ -28,7 +27,8 @@ class InboxWatcher:
     def __init__(
         self,
         inbox_path: Path,
-        process_callback: Optional[Callable[[Dict[str, Any]], Coroutine[Any, Any, None]]] = None,
+        process_callback: Optional[Callable[[
+            Dict[str, Any]], Coroutine[Any, Any, None]]] = None,
         watch_interval: float = 1.0,
     ):
         """
@@ -57,7 +57,7 @@ class InboxWatcher:
         self._running = True
         self._task = asyncio.create_task(self._loop())
         logger.info("Inbox watcher started (path=%s, interval=%.1fs)",
-                     self.inbox_path, self.watch_interval)
+                    self.inbox_path, self.watch_interval)
 
     async def stop(self) -> None:
         """停止监听"""
@@ -69,7 +69,7 @@ class InboxWatcher:
             except asyncio.CancelledError:
                 pass
         logger.info("Inbox watcher stopped (processed=%d, errors=%d)",
-                     self._total_processed, self._total_errors)
+                    self._total_processed, self._total_errors)
 
     @property
     def is_running(self) -> bool:
@@ -160,7 +160,8 @@ class InboxWatcher:
                                    line_no, type(event).__name__)
                     self._total_errors += 1
             except json.JSONDecodeError:
-                logger.warning("Inbox line %d: invalid JSON, skipping", line_no)
+                logger.warning(
+                    "Inbox line %d: invalid JSON, skipping", line_no)
                 self._total_errors += 1
 
         return events