test: fix broken unit tests, add missing fixtures, and stabilize CI pipeline

- Fix os module mock pattern for Vitest v4 in proxy-ide-config tests

- Fix enterprise oauth_client_key expectations in cloudHandler-sync and token-manager-parity tests

- Fix proxy-controller integration test argument expectations

- Add missing proxy-parity JSON fixtures (OpenAI tools, Anthropic tool-use, Gemini SSE)

- Add reasoning_content mapping to convertClaudeToOpenAIResponse

- Fix google-api service test env var cache leak with resetModules + dynamic imports

- Fix proxy-metrics timer tests by calling onModuleInit in beforeEach

- Fix locale-sensitive number formatting in StatCard tests

- Add missing test files to version control (components, hooks, ipc, mocks, server, utils)

- Fix CI workflows: testing.yaml (use vitest run, add type-check job, npm cache), lint.yaml and format.yaml (add npm cache, concurrency, fix job names)

vitest.config.mjs

@@ -1,18 +1,39 @@
 import { defineConfig } from 'vitest/config';
 import path from 'path';
+import viteTsconfigPaths from 'vite-tsconfig-paths';
 
 export default defineConfig({
+  plugins: [viteTsconfigPaths()],
   resolve: {
-    alias: {
-      '@': path.resolve(process.cwd(), './src'),
-      // Mock native modules that fail to load in test environment
-      keytar: path.resolve(process.cwd(), './src/mocks/empty.ts'),
-      'better-sqlite3': path.resolve(process.cwd(), './src/mocks/empty.ts'),
-    },
+    alias: [
+      { find: 'keytar', replacement: path.resolve(process.cwd(), './src/tests/unit/mocks/keytar.ts') },
+      { find: 'better-sqlite3', replacement: path.resolve(process.cwd(), './src/tests/unit/mocks/better-sqlite3.ts') },
+    ],
   },
   test: {
     globals: true,
     environment: 'happy-dom',
-    include: ['src/tests/unit/**/*.test.ts'],
+    include: ['src/tests/unit/**/*.{test,spec}.{ts,tsx}', 'src/tests/integration/**/*.{test,spec}.{ts,tsx}'],
+    exclude: ['src/tests/e2e/**/*'],
+    setupFiles: ['src/tests/unit/setup.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html', 'json'],
+      exclude: [
+        'node_modules/',
+        'src/tests/',
+        'src/mocks/',
+        '**/*.config.*',
+        '**/*.d.ts',
+        '.vite/',
+        'forge.config.ts',
+      ],
+      thresholds: {
+        lines: 40,
+        functions: 40,
+        branches: 30,
+        statements: 40,
+      },
+    },
   },
 });