Remove uploads and logs from git tracking and update .gitignore

- Remove backend/uploads/ directory from git tracking (already in .gitignore)
- Remove backend/server.log from git tracking
- Add *.log, server.log, and backend/server.log to .gitignore
- Remove old dist files from git tracking

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

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

.gitignore

@@ -15,4 +15,16 @@ public/js/bundle.js
 backend/coverage/
 
 # User uploaded files
-backend/uploads/
+backend/uploads/
+
+# Log files
+*.log
+server.log
+backend/server.log
+
+# Build output
+dist/
+build/
+
+# Webpack output
+public/assets/