correcting pixiv connection functionality

backend/app/api/platforms.py

@@ -89,7 +89,7 @@ async def list_platforms():
             "name": "Pixiv",
             "description": "Download artwork from Pixiv artists",
             "requires_auth": True,
-            "auth_type": "cookies",
+            "auth_type": "token",
             "url_pattern": "https://www.pixiv.net/users/{user_id}",
             "url_examples": [
                 "https://www.pixiv.net/users/12345678",
@@ -103,6 +103,7 @@ async def list_platforms():
                 "bookmarks": "Bookmarked works",
             },
             "default_config": gdl_service.get_default_config_for_platform("pixiv"),
+            "notes": "Requires OAuth refresh token. Run 'gallery-dl oauth:pixiv' to obtain one.",
         },
         "deviantart": {
             "name": "DeviantArt",

backend/app/services/gallery_dl.py

@@ -387,6 +387,8 @@ class GalleryDLService:
             "please login",
             "must be logged in",
             "authentication required",
+            "authenticationerror",
+            "refresh-token",  # Pixiv OAuth
             "session expired",
             "invalid cookie",
             "cookies are expired",
@@ -560,6 +562,12 @@ class GalleryDLService:
                 config["extractor"]["discord"] = {}
             config["extractor"]["discord"]["token"] = auth_token
 
+        # Add refresh token for Pixiv
+        if auth_token and platform == "pixiv":
+            if "pixiv" not in config["extractor"]:
+                config["extractor"]["pixiv"] = {}
+            config["extractor"]["pixiv"]["refresh-token"] = auth_token
+
         # Write temporary config file
         with tempfile.NamedTemporaryFile(
             mode="w",

backend/app/tasks/downloads.py

@@ -207,7 +207,7 @@ async def _download_source_async(source_id: int, download_id: int = None) -> dic
             cookies_path = None
             auth_token = None
 
-            if source_platform == "discord":
+            if source_platform in ("discord", "pixiv"):
                 auth_token = await cred_manager.get_token(source_platform)
                 if not auth_token:
                     logger.warning(f"No token for {source_platform}, download may fail")