feat: add multi-gateway management with auto port detection

- Add GatewayManager for multi-profile gateway lifecycle management
- Auto-detect running gateways on startup via PID + health check
- Port conflict detection: check managed gateways, allocated ports, and
  system-level port availability (TCP bind test)
- Two-phase startup: sequential port resolution, parallel process launch
- Use `gateway start/restart` on normal systems, `gateway run --replace`
  on WSL/Docker
- Wait for health check before returning start/stop responses
- Add Gateways page with card-based layout showing profile status
- Reorganize sidebar navigation into collapsible groups
- Hide API server settings (now auto-managed by GatewayManager)
- Profile switch reloads page; Ctrl+C no longer stops gateways
- Remove redundant ensureApiServerConfig from index.ts and profiles.ts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/stores/hermes/gateways.ts

@@ -0,0 +1,51 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { fetchGateways, startGateway, stopGateway, type GatewayStatus } from '@/api/hermes/gateways'
+
+export const useGatewayStore = defineStore('gateways', () => {
+  const gateways = ref<GatewayStatus[]>([])
+  const loading = ref(false)
+
+  async function fetchStatus() {
+    loading.value = true
+    try {
+      const data = await fetchGateways()
+      gateways.value = Array.isArray(data) ? data : Object.values(data || {})
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function start(name: string) {
+    loading.value = true
+    try {
+      const status = await startGateway(name)
+      // Update the specific gateway in the list
+      const idx = gateways.value.findIndex(g => g.profile === name)
+      if (idx >= 0) {
+        gateways.value[idx] = status
+      } else {
+        gateways.value.push(status)
+      }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function stop(name: string) {
+    loading.value = true
+    try {
+      await stopGateway(name)
+      // Update the specific gateway in the list
+      const gw = gateways.value.find(g => g.profile === name)
+      if (gw) {
+        gw.running = false
+        gw.pid = undefined
+      }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  return { gateways, loading, fetchStatus, start, stop }
+})