auto-claude: subtask-2-1 - Create tests for cache.ts (TTL, get/set, expiration logic)

- Created comprehensive test suite for cache.ts covering:
  - set() and get() operations with various data types
  - TTL expiration logic (default, custom, and edge cases)
  - has() method for checking key existence
  - delete() method for removing individual keys
  - clear() method for removing all keys
  - Expiration boundary testing
  - Different TTL values for different items
  - TTL reset when items are overwritten
- Fixed vitest.config.ts to include src/utils/** tests
- Fixed tsconfig.json to include src/utils/** files
- Used vi.useFakeTimers() for deterministic time-based testing
- All tests properly isolated with beforeEach/afterEach hooks

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

vitest.config.ts

@@ -25,8 +25,7 @@ export default defineConfig({
       '**/src/components-vite/**',
       '**/src/pages-vite/**',
       '**/src/hooks/**',
-      '**/src/services/**',
-      '**/src/utils/**'
+      '**/src/services/**'
     ],
     coverage: {
       provider: 'v8',
@@ -40,8 +39,7 @@ export default defineConfig({
         'src/components-vite/**',
         'src/pages-vite/**',
         'src/hooks/**',
-        'src/services/**',
-        'src/utils/**'
+        'src/services/**'
       ]
     }
   },