Optimize model provider selection with category grouping (#1770)

* Initial plan

* Add provider category field to requesters and implement grouped dropdown

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Fix TypeScript type and prettier formatting issues

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Rename provider categories: aggregator→maas, self_deployed→self-hosted

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Move provider_category from metadata to spec section

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* perf: adjust category

* perf: adjust data structure

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>
Co-authored-by: Junyan Qin <rockchinq@gmail.com>

web/src/i18n/locales/zh-Hant.ts

@@ -138,6 +138,9 @@ const zhHant = {
     boolean: '布林值',
     selectModelProvider: '選擇模型供應商',
     modelProviderDescription: '請填寫供應商向您提供的模型名稱',
+    modelManufacturer: '模型廠商',
+    aggregationPlatform: '中轉平台',
+    selfDeployed: '自部署',
     selectModel: '請選擇模型',
     testSuccess: '測試成功',
     testError: '測試失敗，請檢查模型設定',