feat: add AnyRouter presets and update endpoints

- Add AnyRouter provider presets for Claude and Codex with endpoint candidates and base_url
- Simplify PackyCode endpoint candidates to primary domain + SLB for both Claude and Codex
- Set default OPENAI_API_KEY to empty in Codex presets for safety (no placeholder key)
- Update model placeholders to GLM-4.6 / GLM-4.5-Air in en/zh locales

src/i18n/locales/zh.json

@@ -239,8 +239,8 @@
     "visitWebsite": "访问 {{url}}",
     "anthropicModel": "主模型",
     "anthropicSmallFastModel": "快速模型",
-    "modelPlaceholder": "claude-3-7-sonnet-20250219",
-    "smallModelPlaceholder": "claude-3-5-haiku-20241022",
+    "modelPlaceholder": "GLM-4.6",
+    "smallModelPlaceholder": "GLM-4.5-Air",
     "modelHelper": "可选：指定默认使用的 Claude 模型，留空则使用系统默认。",
     "categoryOfficial": "官方",
     "categoryCnOfficial": "开源官方",