add bridge performance monitoring

tests/server/performance-monitor-controller.test.ts

@@ -0,0 +1,40 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+const getOpsRuntimeSnapshot = vi.fn()
+
+vi.mock('../../packages/server/src/services/hermes/ops-monitor', () => ({
+  createEmptyOpsRuntimeSnapshot: (error?: string) => ({ timestamp: 0, error }),
+  getOpsRuntimeSnapshot,
+}))
+
+describe('performance monitor controller', () => {
+  afterEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('returns the runtime snapshot from the performance service', async () => {
+    const snapshot = {
+      timestamp: 1,
+      bridge: { workers: [] },
+      sessions: { active: 0 },
+    }
+    getOpsRuntimeSnapshot.mockResolvedValue(snapshot)
+    const ctx: any = {}
+
+    const { runtime } = await import('../../packages/server/src/controllers/hermes/performance-monitor')
+    await runtime(ctx)
+
+    expect(ctx.body).toBe(snapshot)
+  })
+
+  it('returns a zero snapshot when metrics collection fails', async () => {
+    getOpsRuntimeSnapshot.mockRejectedValue(new Error('boom'))
+    const ctx: any = {}
+
+    const { runtime } = await import('../../packages/server/src/controllers/hermes/performance-monitor')
+    await runtime(ctx)
+
+    expect(ctx.status).toBeUndefined()
+    expect(ctx.body).toEqual({ timestamp: 0, error: 'boom' })
+  })
+})