style: use explicit config path for server project

Address PR review feedback for consistency - use full path
'apps/server/vitest.config.ts' instead of just 'apps/server'.

Note: libs/types has no tests (type definitions only), so it
doesn't need a vitest.config.ts.

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

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

vitest.config.ts

@@ -4,6 +4,6 @@ export default defineConfig({
   test: {
     // Use projects instead of deprecated workspace
     // Glob patterns auto-discover projects with vitest.config.ts
-    projects: ['libs/*/vitest.config.ts', 'apps/server'],
+    projects: ['libs/*/vitest.config.ts', 'apps/server/vitest.config.ts'],
   },
 });