refine(ui): improve model placeholders and simplify provider hints

- Add dedicated Haiku model placeholder "GLM-4.5-Air"
- Unify API key hints for all non-official providers
- Fix AiHubMix category from cn_official to aggregator
- Standardize GLM model name format (glm-4.6)

src/i18n/locales/zh.json

@@ -232,9 +232,9 @@
     "codexOfficialNoApiKey": "官方无需填写 API Key，直接保存即可",
     "codexApiKeyAutoFill": "只需要填这里，下方 auth.json 会自动填充",
     "apiKeyAutoFill": "只需要填这里，下方配置会自动填充",
-    "cnOfficialApiKeyHint": "💡 开源官方供应商只需填写 API Key，请求地址已预设",
-    "aggregatorApiKeyHint": "💡 聚合服务供应商只需填写 API Key 即可使用",
-    "thirdPartyApiKeyHint": "💡 第三方供应商需要填写 API Key 和请求地址",
+    "cnOfficialApiKeyHint": "💡 只需填写 API Key，请求地址已预设",
+    "aggregatorApiKeyHint": "💡 只需填写 API Key，请求地址已预设",
+    "thirdPartyApiKeyHint": "💡 只需填写 API Key，请求地址已预设",
     "customApiKeyHint": "💡 自定义配置需手动填写所有必要字段",
     "officialHint": "💡 官方供应商使用浏览器登录，无需配置 API Key",
     "getApiKey": "获取 API Key",
@@ -263,6 +263,7 @@
     "anthropicDefaultOpusModel": "Opus 默认模型",
     "modelPlaceholder": "GLM-4.6",
     "smallModelPlaceholder": "GLM-4.5-Air",
+    "haikuModelPlaceholder": "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",