test: 新增 8 个测试文件 63 用例 + 覆盖率设施，行覆盖 42.58%→48.24%

- 新增 jsp-extractor/report/method-extractor/fix-prompt/registry/provider-chat/import-service/yaml-parser 测试
- .vscode-test.mjs 加 srcDir+coverage，package.json 加 test:coverage，产出 tests/coverage/（html）
- 修复 method-extractor java fallback 取错捕获组、mockDocument.getText 忽略 range
- 更新 tests/test-cases.md（24 文件 179 条）与 test-execution-log.md（覆盖率记录）

package.json

@@ -336,7 +336,8 @@
     "pretest": "npm run compile && npm run lint",
     "lint": "eslint src",
     "compile:test": "tsc -p ./tsconfig.test.json",
-    "test": "npm run compile:test && vscode-test"
+    "test": "npm run compile:test && vscode-test",
+    "test:coverage": "npm run compile && npm run compile:test && vscode-test --coverage --coverage-output tests/coverage"
   },
   "dependencies": {
     "@eslint/js": "^9.39.3",