feat: optimize vision tools and image handling

- Add model-aware vision tool loading based on supports_vision flag
- Move view_image_tool from config to builtin tools for dynamic inclusion
- Add timeout to image search to prevent hanging requests
- Optimize image search results format using thumbnails
- Add image validation for reference images in generation
- Improve error handling with detailed messages

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/src/community/image_search/tools.py

@@ -46,7 +46,7 @@ def _search_images(
         logger.error("ddgs library not installed. Run: pip install ddgs")
         return []
 
-    ddgs = DDGS()
+    ddgs = DDGS(timeout=30)
 
     try:
         kwargs = {
@@ -119,12 +119,8 @@ def image_search_tool(
     normalized_results = [
         {
             "title": r.get("title", ""),
-            "image_url": r.get("image", ""),
+            "image_url": r.get("thumbnail", ""),
             "thumbnail_url": r.get("thumbnail", ""),
-            "source_url": r.get("url", ""),
-            "source": r.get("source", ""),
-            "width": r.get("width"),
-            "height": r.get("height"),
         }
         for r in results
     ]