Add animated GIF support for profile pictures

- Detect animated GIFs and preserve animation frames during upload
- Extract dominant color from first frame for role color syncing
- Generate multi-frame descriptions using existing video analysis pipeline
- Skip face detection/cropping for GIFs to maintain original animation
- Update UI to inform users about GIF support and Nitro requirement
- Add metadata flag to distinguish animated vs static profile pictures

bot/static/index.html

@@ -592,6 +592,10 @@
           <label for="pfp-upload">Upload Custom Image:</label>
           <input type="file" id="pfp-upload" accept="image/*" style="margin-left: 0.5rem;">
           <button onclick="uploadCustomPfp()">📤 Upload & Apply</button>
+          <div style="font-size: 0.8rem; color: #888; margin-top: 0.3rem; margin-left: 0.5rem;">
+            💡 Supports static images (PNG, JPG) and animated GIFs<br>
+            ⚠️ Animated GIFs require Discord Nitro on the bot account
+          </div>
         </div>
         
         <div id="pfp-status" style="margin-top: 0.5rem; font-size: 0.9rem; color: #61dafb;"></div>