fix: split workbench core mysql access

internal/ai/service_test.go

@@ -27,3 +27,28 @@ func TestFallbackTableAnalysisUnparsedProfile(t *testing.T) {
 		t.Fatalf("last metric value=%q, want 未解析", got)
 	}
 }
+
+func TestFallbackDocumentBuildsDisplayableContent(t *testing.T) {
+	result := fallbackDocument(
+		"生成一个竞争销售部门副科长职位的演讲稿",
+		"竞争销售部门副科长职位演讲稿",
+		"meeting_minutes",
+		Usage{Model: "deepseek-flash"},
+		"AI 输出格式异常，已使用兜底文档。",
+	)
+	if result.Title != "竞争销售部门副科长职位演讲稿" {
+		t.Fatalf("Title=%q, want title hint", result.Title)
+	}
+	if strings.TrimSpace(result.ContentMarkdown) == "" {
+		t.Fatal("ContentMarkdown is empty")
+	}
+	if !strings.Contains(result.ContentMarkdown, "AI 输出格式异常") {
+		t.Fatalf("ContentMarkdown=%q, want fallback reason", result.ContentMarkdown)
+	}
+	if !strings.Contains(result.ContentPlain, "生成一个竞争销售部门副科长职位的演讲稿") {
+		t.Fatalf("ContentPlain=%q, want source text", result.ContentPlain)
+	}
+	if len(result.Sections) != 3 {
+		t.Fatalf("Sections len=%d, want 3", len(result.Sections))
+	}
+}