fix: split workbench core mysql access

internal/ai/service.go

@@ -198,6 +198,7 @@ func (s *Service) GenerateDocument(ctx context.Context, sourceText, titleHint, d
 	if err != nil {
 		return DocumentResult{}, err
 	}
+	usage := usageFromResponse(resp)
 	var out struct {
 		Title           string            `json:"title"`
 		Summary         string            `json:"summary"`
@@ -206,7 +207,7 @@ func (s *Service) GenerateDocument(ctx context.Context, sourceText, titleHint, d
 		Sections        []DocumentSection `json:"sections"`
 	}
 	if err := json.Unmarshal([]byte(ExtractJSONObject(resp.Content)), &out); err != nil {
-		return DocumentResult{}, fmt.Errorf("%w: %v", ErrBadOutput, err)
+		return fallbackDocument(sourceText, titleHint, documentType, usage, "AI 输出格式异常，已使用兜底文档。"), nil
 	}
 	out.Title = strings.TrimSpace(firstNonEmpty(out.Title, titleHint, "智能文档"))
 	out.ContentMarkdown = strings.TrimSpace(out.ContentMarkdown)
@@ -217,7 +218,7 @@ func (s *Service) GenerateDocument(ctx context.Context, sourceText, titleHint, d
 		out.ContentPlain = plainFromSections(out.Sections)
 	}
 	if out.ContentMarkdown == "" {
-		return DocumentResult{}, ErrBadOutput
+		return fallbackDocument(sourceText, titleHint, documentType, usage, "AI 输出缺少文档正文，已使用兜底文档。"), nil
 	}
 	return DocumentResult{
 		Title:           out.Title,
@@ -225,10 +226,47 @@ func (s *Service) GenerateDocument(ctx context.Context, sourceText, titleHint, d
 		ContentPlain:    strings.TrimSpace(out.ContentPlain),
 		Sections:        out.Sections,
 		Summary:         strings.TrimSpace(out.Summary),
-		Usage:           usageFromResponse(resp),
+		Usage:           usage,
 	}, nil
 }
 
+func fallbackDocument(sourceText, titleHint, documentType string, usage Usage, reason string) DocumentResult {
+	title := firstNonEmpty(titleHint, documentTypeTitle(documentType), excerptPlain(sourceText, 30), "智能文档")
+	source := strings.TrimSpace(sourceText)
+	if source == "" {
+		source = "用户未提供有效原文。"
+	}
+	sections := []DocumentSection{
+		{Heading: "处理说明", Content: reason},
+		{Heading: "用户输入", Content: source},
+		{Heading: "后续建议", Content: "建议检查原始输入是否完整，或重新发起生成以获取更完整的智能文档。"},
+	}
+	contentMarkdown := markdownFromSections(sections)
+	return DocumentResult{
+		Title:           title,
+		ContentMarkdown: contentMarkdown,
+		ContentPlain:    plainFromSections(sections),
+		Sections:        sections,
+		Summary:         excerptPlain(source, 120),
+		Usage:           usage,
+	}
+}
+
+func documentTypeTitle(documentType string) string {
+	switch strings.TrimSpace(documentType) {
+	case "meeting_minutes":
+		return "会议纪要"
+	case "speech":
+		return "演讲稿"
+	case "proposal":
+		return "方案文档"
+	case "summary":
+		return "内容总结"
+	default:
+		return ""
+	}
+}
+
 func (s *Service) AnalyzeTable(ctx context.Context, input TableAnalysisInput) (TableAnalysisResult, error) {
 	if s == nil || s.client == nil {
 		return TableAnalysisResult{}, ErrNotConfigured