feat(storage): persist local images and unify clipboard copying

Add a private images disk with persistent container mounts and installation/upgrade setup, while routing avatar and project icon storage through it. Reuse the copy button component for API tokens and support clipboard copying through the shared helper.

scripts/install.sh

@@ -229,6 +229,7 @@ if [ "$WARNING_SPACE" = true ]; then
 fi
 
 mkdir -p /data/coolify/{source,ssh,applications,databases,backups,services,proxy,sentinel}
+mkdir -p /data/coolify/images
 mkdir -p /data/coolify/ssh/{keys,mux}
 mkdir -p /data/coolify/proxy/dynamic
 

scripts/upgrade.sh

@@ -170,6 +170,10 @@ else
     log "Network 'coolify' already exists"
 fi
 
+mkdir -p /data/coolify/images/{avatars,project-icons}
+chown -R 9999:root /data/coolify/images
+chmod -R 700 /data/coolify/images
+
 # Fix SSH directory ownership if not owned by container user UID 9999 (fixes #6621)
 # Only changes owner — preserves existing group to respect custom setups
 SSH_OWNER=$(stat -c '%u' /data/coolify/ssh 2>/dev/null || echo "unknown")