feat: Add automatic short link resolution for b23.tv

- Use requests library to follow redirects and resolve b23.tv short links
- Automatically extract BV ID from resolved URL
- Support both short links and full URLs seamlessly

skills/kb-link-parser/link-parser.py

@@ -64,7 +64,14 @@ class LinkParser:
         """
         # Check if it's a known short link pattern
         if self.shortlink_resolver.is_bilibili_short_link(url):
-            return url
+            # Try to resolve using requests (follows redirects)
+            try:
+                import requests
+                response = requests.head(url, allow_redirects=True, timeout=10)
+                return response.url
+            except Exception:
+                # Fallback: return original URL
+                return url
 
         return url