Rename Modal app to explainor-v2 for fresh deployment

Force new container deployment to clear cached ASGI code
causing SSE streaming 404 errors.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

modal_app.py

@@ -8,7 +8,7 @@ import os
 import modal
 
 # Define the Modal app
-app = modal.App("explainor")
+app = modal.App("explainor-v2")
 
 # Create image with dependencies
 image = (