feat: multi-gateway profile support, provider management overhaul, and model settings tab

- Profile-aware proxy: inject API key from profile-specific .env, route requests via X-Hermes-Profile header
- Remove auth.json dependency: built-in providers use .env, custom providers use config.yaml
- Add allProviders field to available-models response with all hardcoded provider catalogs
- Add Models tab in Settings for editing provider API keys (built-in → .env, custom → config.yaml)
- Add PUT /api/config/providers/:poolKey for updating provider credentials
- ProviderFormModal uses backend allProviders for preset dropdown
- Gateway log format support: parse both agent and gateway log formats
- Add webui server.log to log viewer with log rotation at 3MB
- Fix provider delete loading state and OAuth provider cleanup
- Setup script: require Node.js 23+, auto-upgrade if version too low

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

packages/server/src/services/hermes/hermes-profile.ts

@@ -54,3 +54,14 @@ export function getActiveProfileName(): string {
     return 'default'
   }
 }
+
+/**
+ * Get profile directory by name.
+ * default → ~/.hermes/
+ * other   → ~/.hermes/profiles/{name}/
+ */
+export function getProfileDir(name: string): string {
+  if (!name || name === 'default') return HERMES_BASE
+  const dir = join(HERMES_BASE, 'profiles', name)
+  return existsSync(dir) ? dir : HERMES_BASE
+}