[moz] fix: CI lint E303 + F401 修复

- toolchain_handler.py: 删除多余空行 (E303)
- toolchain_templates.py: 删除 unused json import (F401)

src/daemon/toolchain_handler.py

@@ -331,7 +331,6 @@ class ToolchainHandler(BaseTaskHandler):
                         return VerifyResult(True, "merged_passthrough",
                                             "review_merged auto-pass")
 
-
                     # 特殊处理:issue_closed 始终通过(纯通知, §21 §11)
                     if meta.get("action_type") == "issue_closed":
                         return VerifyResult(True, "issue_closed_passthrough",

src/daemon/toolchain_templates.py

@@ -5,7 +5,7 @@
 
 from __future__ import annotations
 
-import json
+
 import logging
 from collections import defaultdict
 from pathlib import Path