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/server/src/routes/hermes/gateways.ts

@@ -0,0 +1,71 @@
+import Router from '@koa/router'
+
+export const gatewayRoutes = new Router()
+
+// Get singleton instance — set during bootstrap
+let manager: any = null
+
+export function setGatewayManager(mgr: any) {
+  manager = mgr
+}
+
+export function getGatewayManager(): any {
+  return manager
+}
+
+// List all gateway statuses
+gatewayRoutes.get('/api/hermes/gateways', async (ctx) => {
+  if (!manager) {
+    ctx.status = 503
+    ctx.body = { error: 'GatewayManager not initialized' }
+    return
+  }
+  const gateways = await manager.listAll()
+  ctx.body = { gateways }
+})
+
+// Start a profile's gateway
+gatewayRoutes.post('/api/hermes/gateways/:name/start', async (ctx) => {
+  if (!manager) {
+    ctx.status = 503
+    ctx.body = { error: 'GatewayManager not initialized' }
+    return
+  }
+  const { name } = ctx.params
+  try {
+    const status = await manager.start(name)
+    ctx.body = { success: true, gateway: status }
+  } catch (err: any) {
+    ctx.status = 500
+    ctx.body = { error: err.message }
+  }
+})
+
+// Stop a profile's gateway
+gatewayRoutes.post('/api/hermes/gateways/:name/stop', async (ctx) => {
+  if (!manager) {
+    ctx.status = 503
+    ctx.body = { error: 'GatewayManager not initialized' }
+    return
+  }
+  const { name } = ctx.params
+  try {
+    await manager.stop(name)
+    ctx.body = { success: true }
+  } catch (err: any) {
+    ctx.status = 500
+    ctx.body = { error: err.message }
+  }
+})
+
+// Check a profile's gateway health
+gatewayRoutes.get('/api/hermes/gateways/:name/health', async (ctx) => {
+  if (!manager) {
+    ctx.status = 503
+    ctx.body = { error: 'GatewayManager not initialized' }
+    return
+  }
+  const { name } = ctx.params
+  const status = await manager.detectStatus(name)
+  ctx.body = { gateway: status }
+})