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>

pkg/provider/modelmgr/requesters/ppiochatcmpl.yaml

@@ -3,36 +3,37 @@ kind: LLMAPIRequester
 metadata:
   name: ppio-chat-completions
   label:
-    en_US: ppio 
+    en_US: ppio
     zh_Hans: 派欧云
   icon: ppio.svg
 spec:
   config:
-    - name: base_url
-      label:
-        en_US: Base URL
-        zh_Hans: 基础 URL
-      type: string
-      required: true
-      default: "https://api.ppinfra.com/v3/openai"
-    - name: args
-      label:
-        en_US: Args
-        zh_Hans: 附加参数
-      type: object
-      required: true
-      default: {}
-    - name: timeout
-      label:
-        en_US: Timeout
-        zh_Hans: 超时时间
-      type: int
-      required: true
-      default: 120
+  - name: base_url
+    label:
+      en_US: Base URL
+      zh_Hans: 基础 URL
+    type: string
+    required: true
+    default: https://api.ppinfra.com/v3/openai
+  - name: args
+    label:
+      en_US: Args
+      zh_Hans: 附加参数
+    type: object
+    required: true
+    default: {}
+  - name: timeout
+    label:
+      en_US: Timeout
+      zh_Hans: 超时时间
+    type: int
+    required: true
+    default: 120
   support_type:
-    - llm
-    - text-embedding
+  - llm
+  - text-embedding
+  provider_category: maas
 execution:
   python:
     path: ./ppiochatcmpl.py
-    attr: PPIOChatCompletions
+    attr: PPIOChatCompletions