fix(auto): address PR #2131 review issues

- Fix OAuth expiry handling for ISO strings in virtualFactory.ts
- Move AutoRoutingBanner test from src/ to tests/unit/shared/components/
- Remove mock metrics from analytics endpoint, return only real data
- Fix error handling for bare 'auto' prefix in chat.ts (check isAutoRouting)
- Update vitest.config.ts to include tests/unit/**/*.test.tsx pattern

src/app/api/analytics/auto-routing/route.ts

@@ -59,22 +59,14 @@ export async function GET(request: Request) {
         GROUP BY provider
         ORDER BY count DESC
         LIMIT 10
-      `
+        `
       )
       .all() as Array<{ provider: string; count: number }>;
 
-    // Mock metrics (would need actual scoring data from auto-combo engine)
-    const mockMetrics = {
-      avgSelectionScore: 0.85,
-      explorationRate: 0.05,
-      lkgpHitRate: 0.72,
-    };
-
     return NextResponse.json({
       totalRequests: totalRequests.count,
       variantBreakdown,
       topProviders,
-      ...mockMetrics,
     });
   } catch (error) {
     console.error("Auto-routing analytics error:", error);
@@ -82,9 +74,6 @@ export async function GET(request: Request) {
       totalRequests: 0,
       variantBreakdown: {},
       topProviders: [],
-      avgSelectionScore: 0,
-      explorationRate: 0.05,
-      lkgpHitRate: 0,
     });
   }
 }