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/views/hermes/SettingsView.vue

@@ -63,72 +63,6 @@ async function saveApiServer(values: Record<string, any>) {
           <NTabPane name="privacy" :tab="t('settings.tabs.privacy')">
             <PrivacySettings />
           </NTabPane>
-          <NTabPane name="api_server" :tab="t('settings.tabs.apiServer')">
-            <section class="settings-section">
-              <SettingRow
-                :label="t('settings.apiServer.enable')"
-                :hint="t('settings.apiServer.enableHint')"
-              >
-                <NSwitch
-                  :value="settingsStore.platforms?.api_server?.enabled"
-                  @update:value="(v) => saveApiServer({ enabled: v })"
-                />
-              </SettingRow>
-              <SettingRow
-                :label="t('settings.apiServer.host')"
-                :hint="t('settings.apiServer.hostHint')"
-              >
-                <NInput
-                  :default-value="settingsStore.platforms?.api_server?.host || ''"
-                  size="small"
-                  class="input-md"
-                  @change="(v: string) => saveApiServer({ host: v })"
-                />
-              </SettingRow>
-              <SettingRow
-                :label="t('settings.apiServer.port')"
-                :hint="t('settings.apiServer.portHint')"
-              >
-                <NInputNumber
-                  :default-value="settingsStore.platforms?.api_server?.port"
-                  :min="1024"
-                  :max="65535"
-                  size="small"
-                  class="input-sm"
-                  @blur="(e: FocusEvent) => {
-                    const val = (e.target as HTMLInputElement).value
-                    if (val) saveApiServer({ port: Number(val) })
-                  }"
-                />
-              </SettingRow>
-              <SettingRow
-                :label="t('settings.apiServer.key')"
-                :hint="t('settings.apiServer.keyHint')"
-              >
-                <NInput
-                  :default-value="settingsStore.platforms?.api_server?.key || ''"
-                  type="password"
-                  show-password-on="click"
-                  size="small"
-                  class="input-md"
-                  @change="(v: string) => saveApiServer({ key: v })"
-                />
-              </SettingRow>
-              <SettingRow
-                :label="t('settings.apiServer.cors')"
-                :hint="t('settings.apiServer.corsHint')"
-              >
-                <NInput
-                  :default-value="
-                    settingsStore.platforms?.api_server?.cors_origins || ''
-                  "
-                  size="small"
-                  class="input-md"
-                  @change="(v: string) => saveApiServer({ cors_origins: v })"
-                />
-              </SettingRow>
-            </section>
-          </NTabPane>
         </NTabs>
       </NSpin>
     </div>