feat: support author prefix in output filename

Douyin.py

@@ -138,9 +138,19 @@ def choose_video_url(url_list: list[str]) -> str:
     raise ValueError("url_list 为空，无法选择视频地址。")
 
 
-def build_output_path(title: str, video_id: str, output_dir: Path = Path("video")) -> Path:
+def build_output_path(
+    title: str, 
+    video_id: str, 
+    output_dir: Path = Path("video"),
+    author_name: str | None = None,
+) -> Path:
     safe_title = sanitize_filename(title, fallback="untitled")
-    return output_dir / f"{safe_title}-{video_id}.mp4"
+    if author_name:
+        safe_author = sanitize_filename(author_name, fallback="unknown")
+        filename = f"[{safe_author}]{safe_title}-{video_id}.mp4"
+    else:
+        filename = f"{safe_title}-{video_id}.mp4"
+    return output_dir / filename
 
 
 def build_browser_address(browser_port: int | None) -> str | None:

test_douyin.py

@@ -82,6 +82,15 @@ class DouyinModuleTests(unittest.TestCase):
         output_path = module.build_output_path("测试标题", "123456")
         self.assertEqual(output_path.as_posix(), "video/测试标题-123456.mp4")
 
+    def test_build_output_path_with_author_uses_bracket_format(self) -> None:
+        module = importlib.import_module("Douyin")
+        output_path = module.build_output_path(
+            title="测试标题", 
+            video_id="123456",
+            author_name="测试博主"
+        )
+        self.assertEqual(output_path.as_posix(), "video/[测试博主]测试标题-123456.mp4")
+
     def test_extract_aweme_payload_uses_dict_body(self) -> None:
         module = importlib.import_module("Douyin")
         response = FakeResponse({"aweme_list": []}, "")