fix: standardize AI plugin configuration format

- Change plugin name from 'atest-ai-openai' to 'atest-ext-ai' following naming convention
- Remove specific OpenAI parameters and implementation details
- Keep only the essential configuration matching other plugins format
- AI plugin now follows exact same structure as atest-store-database
- Only difference is the categories: ['ai'] field for classification

Author: KariHall619

pkg/testing/testdata/data/core/extension.yaml

@@ -3,19 +3,8 @@ items:
     dependencies:
       - name: atest-store-database
     link: https://github.com/LinuxSuRen/atest-ext-store-database
-  - name: atest-ai-openai
+  - name: atest-ext-ai
     dependencies:
-      - name: atest-ai-openai
-    link: https://github.com/LinuxSuRen/atest-ext-ai-openai
+      - name: atest-ext-ai
+    link: https://github.com/LinuxSuRen/atest-ext-ai
     categories: ["ai"]
-    params:
-      - key: api_key
-        description: OpenAI API Key
-        defaultValue: ""
-      - key: model
-        description: OpenAI Model
-        defaultValue: "gpt-4"
-        enum: ["gpt-3.5-turbo", "gpt-4", "gpt-4-turbo"]
-      - key: temperature
-        description: Sampling temperature
-        defaultValue: "0.7"