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>

packages/builtin-tools/src/tools/LSPTool/__tests__/formatters.test.ts

@@ -1,9 +1,7 @@
 import { mock, describe, expect, test } from "bun:test";
+import { debugMock } from "../../../../../../tests/mocks/debug";
 
-mock.module("src/utils/debug.ts", () => ({
-  logForDebugging: () => {},
-  isDebugMode: () => false,
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 const {
   formatGoToDefinitionResult,