refactor: 统一 log.ts/debug.ts 的测试 mock 为共享定义

- 新增 tests/mocks/log.ts 和 tests/mocks/debug.ts，覆盖源文件全部实际导出
- 移除旧 mock 中不存在的导出（logToFile、logEvent、getLogFilePath）
- 13 个测试文件改为使用共享 mock，避免定义分散和不一致

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/utils/__tests__/json.test.ts

@@ -1,12 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock log.ts to cut the heavy dependency chain (log.ts → bootstrap/state.ts → analytics)
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const { safeParseJSON, safeParseJSONC, parseJSONL, addItemToJSONCArray } =
   await import("../json");