Add missing metadata API routes to test mock

The test mock in simulateBrowser.ts was missing critical HTTP handlers for metadata API endpoints that the ObjectStackClient uses to query agents and tools:

1. Added GET /api/v1/meta handler (base route that returns all metadata types)
2. Added generic GET /api/v1/meta/:type handler (for querying any metadata type like 'agent', 'tool', etc.)

Without these handlers, the client's meta.getTypes() and meta.getItems('agent'/'tool') calls would fail in tests, making it appear that agents and tools were not registered even though the broker shim was correctly querying MetadataService.

This was the final missing piece - the broker shim fix in commit 322a2a6 made agents/tools queryable from the kernel, but the test infrastructure couldn't actually test it because the HTTP routes weren't mocked.

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/b6593eda-d805-4d4d-8a8d-10f5438b7a25

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

apps/studio/src/mocks/simulateBrowser.ts

@@ -142,6 +142,17 @@ export async function simulateBrowser() {
             }
         }),
 
+        // Metadata - Get all types (base route returns types)
+        http.get('http://localhost:3000/api/v1/meta', async () => {
+             console.log('[VirtualNetwork] GET /meta (types)');
+             try {
+                 const result = await (kernel as any).broker.call('metadata.types', {});
+                 return HttpResponse.json({ success: true, data: result });
+             } catch (err: any) {
+                  return HttpResponse.json({ error: err.message }, { status: 500 });
+             }
+        }),
+
         // Metadata - Objects List (Singular & Plural support)
         http.get('http://localhost:3000/api/v1/meta/object', async () => {
              console.log('[VirtualNetwork] GET /meta/object');
@@ -194,6 +205,22 @@ export async function simulateBrowser() {
              } catch (err: any) {
                   return HttpResponse.json({ error: err.message }, { status: 500 });
              }
+        }),
+
+        // Metadata - Generic type list (for agents, tools, etc.)
+        // This must come AFTER specific routes like /meta/object to avoid conflicts
+        http.get('http://localhost:3000/api/v1/meta/:type', async ({ params }) => {
+             // Skip if it's a specific route we already handled
+             if (params.type === 'object' || params.type === 'objects') {
+                 return;
+             }
+             console.log(`[VirtualNetwork] GET /meta/${params.type}`);
+             try {
+                 const result = await (kernel as any).broker.call(`metadata.${params.type}`, {});
+                 return HttpResponse.json({ success: true, data: result });
+             } catch (err: any) {
+                  return HttpResponse.json({ error: err.message }, { status: 500 });
+             }
         })
     ];