refactor: use glob patterns for vitest projects configuration

Address PR review feedback:
- Use 'libs/*/vitest.config.ts' glob to auto-discover lib projects
- Simplify test:packages script to use --project='!server' exclusion
- New libs with vitest.config.ts will be automatically included

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

vitest.config.ts

@@ -3,14 +3,7 @@ import { defineConfig } from 'vitest/config';
 export default defineConfig({
   test: {
     // Use projects instead of deprecated workspace
-    projects: [
-      'libs/utils',
-      'libs/platform',
-      'libs/prompts',
-      'libs/model-resolver',
-      'libs/dependency-resolver',
-      'libs/git-utils',
-      'apps/server',
-    ],
+    // Glob patterns auto-discover projects with vitest.config.ts
+    projects: ['libs/*/vitest.config.ts', 'apps/server'],
   },
 });