feat: integrate creator hub douyin workflows

internal/creator/content_test.go

@@ -0,0 +1,20 @@
+package creator
+
+import "testing"
+
+func TestParseGeneratedRewriteRequiresBoundedJSON(t *testing.T) {
+	title, script, err := parseGeneratedRewrite(`{"title":"新标题","script":"新脚本"}`)
+	if err != nil || title != "新标题" || script != "新脚本" {
+		t.Fatalf("parseGeneratedRewrite() = %q, %q, %v", title, script, err)
+	}
+	for _, content := range []string{
+		"",
+		"不是 JSON",
+		`{"title":"有标题"}`,
+		`{"title":"标题","script":""}`,
+	} {
+		if _, _, err := parseGeneratedRewrite(content); err == nil {
+			t.Fatalf("parseGeneratedRewrite(%q) accepted invalid output", content)
+		}
+	}
+}