feat(weibo): add Sina Weibo video uploader

- New uploader/weibo_uploader module: passport QR-code cookie login,
  upload flow with title/desc/tags, cover and collection support
- sau_cli: add 'weibo login/check/upload-video' subcommands
- utils/log.py: register weibo logger

sau_cli.py

@@ -33,6 +33,11 @@ from uploader.tencent_uploader.main import (
     cookie_auth as tencent_cookie_auth,
     tencent_setup,
 )
+from uploader.weibo_uploader.main import (
+    WeiBoVideo,
+    weibo_setup,
+    cookie_auth as weibo_cookie_auth,
+)
 from uploader.xiaohongshu_uploader.main import (
     XIAOHONGSHU_PUBLISH_STRATEGY_IMMEDIATE,
     XIAOHONGSHU_PUBLISH_STRATEGY_SCHEDULED,
@@ -168,6 +173,19 @@ class TencentVideoUploadRequest:
     headless: bool = True
 
 
+@dataclass(slots=True)
+class WeiboVideoUploadRequest:
+    account_name: str
+    video_file: Path
+    title: str
+    description: str
+    tags: list[str]
+    thumbnail_file: Path | None = None
+    collection_name: str | None = None
+    debug: bool = True
+    headless: bool = True
+
+
 @dataclass(slots=True)
 class YouTubeVideoUploadRequest:
     account_name: str
@@ -549,6 +567,41 @@ async def upload_tencent_video(request: TencentVideoUploadRequest) -> Path:
     return account_file
 
 
+async def login_weibo_account(account_name: str, headless: bool = True, qrcode_callback=None) -> dict:
+    account_file = resolve_account_file("weibo", account_name)
+    return await weibo_setup(str(account_file), handle=True, return_detail=True, headless=headless, qrcode_callback=qrcode_callback)
+
+
+async def check_weibo_account(account_name: str) -> bool:
+    account_file = resolve_account_file("weibo", account_name)
+    if not account_file.exists():
+        return False
+    return await weibo_cookie_auth(str(account_file))
+
+
+async def upload_weibo_video(request: WeiboVideoUploadRequest) -> Path:
+    account_file = resolve_account_file("weibo", request.account_name)
+    is_ready = await weibo_setup(str(account_file), handle=False)
+    if not is_ready:
+        raise RuntimeError(
+            f"Weibo cookie is missing or expired: {account_file}. Run `sau weibo login --account {request.account_name}` first."
+        )
+
+    app = WeiBoVideo(
+        title=request.title,
+        file_path=str(request.video_file),
+        tags=request.tags,
+        account_file=str(account_file),
+        desc=request.description,
+        thumbnail_path=str(request.thumbnail_file) if request.thumbnail_file else None,
+        collection_name=request.collection_name,
+        debug=request.debug,
+        headless=request.headless,
+    )
+    await app.main()
+    return account_file
+
+
 def existing_file_path(value: str) -> Path:
     path = Path(value)
     if not path.is_file():
@@ -716,6 +769,26 @@ def build_parser() -> argparse.ArgumentParser:
     tencent_upload_video_parser.add_argument("--draft", action="store_true", help="Save as draft instead of publishing")
     add_runtime_flags(tencent_upload_video_parser)
 
+    # ── Weibo ──
+    weibo_parser = platform_parsers.add_parser("weibo", help="Sina Weibo operations")
+    weibo_actions = weibo_parser.add_subparsers(dest="action", required=True)
+
+    for action_name in ("login", "check"):
+        action_parser = weibo_actions.add_parser(action_name, help=f"Weibo {action_name}")
+        action_parser.add_argument("--account", required=True, help="Weibo user-defined account_name")
+        if action_name == "login":
+            add_runtime_flags(action_parser)
+
+    weibo_upload_video_parser = weibo_actions.add_parser("upload-video", help="Upload one video to Weibo")
+    weibo_upload_video_parser.add_argument("--account", required=True, help="Weibo user-defined account_name")
+    weibo_upload_video_parser.add_argument("--file", required=True, type=existing_file_path, help="Video file path")
+    weibo_upload_video_parser.add_argument("--title", required=True, help="Video title (max 30 chars)")
+    weibo_upload_video_parser.add_argument("--desc", default="", help="Optional video description")
+    weibo_upload_video_parser.add_argument("--tags", default="", help="Comma-separated tags, such as tag1,tag2")
+    weibo_upload_video_parser.add_argument("--thumbnail", type=existing_file_path, help="Optional cover image path (<5MB)")
+    weibo_upload_video_parser.add_argument("--collection", default=None, help="Optional collection name")
+    add_runtime_flags(weibo_upload_video_parser)
+
     youtube_parser = platform_parsers.add_parser("youtube", help="YouTube operations")
     youtube_actions = youtube_parser.add_subparsers(dest="action", required=True)
 
@@ -984,6 +1057,37 @@ async def dispatch(args: argparse.Namespace) -> int:
 
         raise RuntimeError(f"Unsupported Tencent/WeChat Channels action: {args.action}")
 
+    if args.platform == "weibo":
+        if args.action == "login":
+            result = await login_weibo_account(args.account, headless=args.headless)
+            if not result["success"]:
+                raise RuntimeError(result["message"])
+            print(f"Weibo login flow completed: {result['account_file']}")
+            return 0
+
+        if args.action == "check":
+            is_valid = await check_weibo_account(args.account)
+            print("valid" if is_valid else "invalid")
+            return 0 if is_valid else 1
+
+        if args.action == "upload-video":
+            request = WeiboVideoUploadRequest(
+                account_name=args.account,
+                video_file=args.file,
+                title=args.title,
+                description=args.desc,
+                tags=parse_tags(args.tags),
+                thumbnail_file=args.thumbnail,
+                collection_name=args.collection,
+                debug=args.debug,
+                headless=args.headless,
+            )
+            await upload_weibo_video(request)
+            print(f"Weibo video upload submitted: {request.video_file}")
+            return 0
+
+        raise RuntimeError(f"Unsupported Weibo action: {args.action}")
+
     if args.platform == "youtube":
         if args.action == "login":
             result = await login_youtube_account(args.account, headless=args.headless)