fix(caddy): disable browser caching for schema files

Add Cache-Control: no-cache, must-revalidate for /schemas/* paths
This ensures frontend always fetches fresh YAML content after updates

infrastructure/caddy/Caddyfile

@@ -34,6 +34,19 @@
 (static_files) {
 	root * /var/www/glam-frontend
 	
+	# Schema files (YAML/JSON) should never be cached by browsers
+	# This ensures frontend always fetches fresh schema content after updates
+	@schemas {
+		path /schemas/*
+	}
+	handle @schemas {
+		header Cache-Control "no-cache, must-revalidate"
+		header Pragma "no-cache"
+		file_server {
+			precompressed gzip br
+		}
+	}
+	
 	# CRITICAL FIX: Handle /assets/* separately - return 404 if not found
 	# This prevents SPA fallback from serving index.html for missing JS chunks
 	# which would cause "error loading dynamically imported module" errors