feat(models): 增加模型显示名重命名 (#614)

* feat(models): add WUI model display aliases

Persist display-only model aliases in Web UI app config, surface them in the model selector/search, and keep canonical model IDs for Hermes calls.

* fix(models): improve WUI model alias editing

* fix(models): clarify unlisted model picker

* fix(models): scope aliases to providers

packages/server/src/services/app-config.ts

@@ -18,6 +18,10 @@ export interface AppConfig {
   // owns the provider list, system credentials are merely a fallback source.
   copilotEnabled?: boolean
 
+  // Web UI-only model display aliases. Keys are provider -> canonical model ID -> display label.
+  // These aliases never replace the canonical model ID sent back to Hermes.
+  modelAliases?: Record<string, Record<string, string>>
+
   // Web UI-only model picker visibility. This filters what the WUI exposes in
   // its sidebar/model pages and never renames or rewrites Hermes canonical
   // provider/model IDs. Hermes CLI config remains the upstream source of truth.