feat(analysis): unify code analysis workflow with default template support

- Consolidate instant analysis to always use analyze_code_with_rules method
- Add use_default_template parameter to automatically select database default template when none specified
- Implement fallback logic to use hardcoded defaults only when no database template available
- Auto-select default prompt template on frontend page load
- Add visual labels for language and template selection dropdowns
- Improve template selector UX by removing empty default option and showing default indicator
- Simplifies analysis flow by removing conditional branching between analyze_code and analyze_code_with_rules

backend/app/api/v1/endpoints/scan.py

@@ -437,14 +437,13 @@ async def instant_analysis(
     
     try:
         # 如果指定了提示词模板，使用自定义分析
-        if req.prompt_template_id:
+        # 统一使用 analyze_code_with_rules，会自动使用默认模板
-            result = await llm_service.analyze_code_with_rules(
+        result = await llm_service.analyze_code_with_rules(
-                req.code, req.language,
+            req.code, req.language,
-                prompt_template_id=req.prompt_template_id,
+            prompt_template_id=req.prompt_template_id,
-                db_session=db
+            db_session=db,
-            )
+            use_default_template=True  # 没有指定模板时使用数据库中的默认模板
-        else:
+        )
-            result = await llm_service.analyze_code(req.code, req.language)
     except Exception as e:
         # 分析失败，返回错误信息
         error_msg = str(e)

backend/app/services/llm/service.py

@@ -779,7 +779,8 @@ Please analyze the following code:
         language: str,
         rule_set_id: Optional[str] = None,
         prompt_template_id: Optional[str] = None,
-        db_session = None
+        db_session = None,
+        use_default_template: bool = True
     ) -> Dict[str, Any]:
         """
         使用指定的规则集和提示词模板分析代码
@@ -790,6 +791,7 @@ Please analyze the following code:
             rule_set_id: 规则集ID（可选）
             prompt_template_id: 提示词模板ID（可选）
             db_session: 数据库会话
+            use_default_template: 当没有指定模板时是否使用数据库中的默认模板
         """
         custom_prompt = None
         rules = None
@@ -797,10 +799,10 @@ Please analyze the following code:
         if db_session:
             from sqlalchemy.future import select
             from sqlalchemy.orm import selectinload
+            from app.models.prompt_template import PromptTemplate
             
             # 获取提示词模板
             if prompt_template_id:
-                from app.models.prompt_template import PromptTemplate
                 result = await db_session.execute(
                     select(PromptTemplate).where(PromptTemplate.id == prompt_template_id)
                 )
@@ -808,6 +810,20 @@ Please analyze the following code:
                 if template:
                     output_language = self._get_output_language()
                     custom_prompt = template.content_zh if output_language == 'zh-CN' else template.content_en
+            elif use_default_template:
+                # 没有指定模板时，使用数据库中的默认模板
+                result = await db_session.execute(
+                    select(PromptTemplate).where(
+                        PromptTemplate.is_default == True,
+                        PromptTemplate.is_active == True,
+                        PromptTemplate.template_type == 'system'
+                    )
+                )
+                template = result.scalar_one_or_none()
+                if template:
+                    output_language = self._get_output_language()
+                    custom_prompt = template.content_zh if output_language == 'zh-CN' else template.content_en
+                    logger.info(f"📋 使用默认提示词模板: {template.name}")
             
             # 获取规则集
             if rule_set_id:
@@ -836,7 +852,7 @@ Please analyze the following code:
         if custom_prompt:
             return await self.analyze_code_with_custom_prompt(code, language, custom_prompt, rules)
         
-        # 否则使用默认分析
+        # 否则使用硬编码的默认分析（兜底）
         return await self.analyze_code(code, language)
 
 

frontend/src/pages/InstantAnalysis.tsx

@@ -82,6 +82,13 @@ export default function InstantAnalysis() {
       try {
         const res = await getPromptTemplates({ is_active: true });
         setPromptTemplates(res.items);
+        // 自动选中默认模板
+        const defaultTemplate = res.items.find(t => t.is_default);
+        if (defaultTemplate) {
+          setSelectedPromptTemplateId(defaultTemplate.id);
+        } else if (res.items.length > 0) {
+          setSelectedPromptTemplateId(res.items[0].id);
+        }
       } catch (error) {
         console.error("加载提示词模板失败:", error);
       }
@@ -712,7 +719,8 @@ class UserManager {
         <div className="p-6 space-y-4">
           {/* 工具栏 */}
           <div className="flex flex-col sm:flex-row gap-3">
-            <div className="flex-1">
+            <div className="flex-1 space-y-1">
+              <label className="text-xs font-bold text-gray-600 uppercase font-mono">编程语言</label>
               <Select value={language} onValueChange={setLanguage}>
                 <SelectTrigger className="h-10 retro-input rounded-none border-2 border-black shadow-[2px_2px_0px_0px_rgba(0,0,0,1)] focus:ring-0">
                   <SelectValue placeholder="选择编程语言" />
@@ -726,19 +734,19 @@ class UserManager {
                 </SelectContent>
               </Select>
             </div>
-            <div className="flex-1">
+            <div className="flex-1 space-y-1">
+              <label className="text-xs font-bold text-gray-600 uppercase font-mono">提示词模板</label>
               <Select value={selectedPromptTemplateId} onValueChange={setSelectedPromptTemplateId}>
                 <SelectTrigger className="h-10 retro-input rounded-none border-2 border-black shadow-[2px_2px_0px_0px_rgba(0,0,0,1)] focus:ring-0">
                   <div className="flex items-center gap-2">
                     <MessageSquare className="w-4 h-4 text-purple-600" />
-                    <SelectValue placeholder="默认提示词" />
+                    <SelectValue placeholder="选择提示词模板" />
                   </div>
                 </SelectTrigger>
                 <SelectContent className="rounded-none border-2 border-black shadow-[4px_4px_0px_0px_rgba(0,0,0,1)]">
-                  <SelectItem value="">默认提示词</SelectItem>
                   {promptTemplates.map((pt) => (
                     <SelectItem key={pt.id} value={pt.id}>
-                      {pt.name}
+                      {pt.name} {pt.is_default && '(默认)'}
                     </SelectItem>
                   ))}
                 </SelectContent>