fix: update Qwen model names to correctly supported versions

- Replaced qwen-coder-plus (which failed with 400) with qwen2.5-coder-32b-instruct
- Updated available models list with qwen2.5-coder series
- Corrected store defaults

lib/services/qwen-oauth.ts

@@ -1114,11 +1114,11 @@ Perform analysis based on provided instructions.`,
 
   getAvailableModels(): string[] {
     return [
-      "qwen-coder-plus",
+      "qwen2.5-coder-32b-instruct",
+      "qwen2.5-coder-7b-instruct",
       "qwen-plus",
       "qwen-turbo",
       "qwen-max",
-      "qwen-coder-turbo",
     ];
   }
 }