initial devcontainer setup

.devcontainer/Caddyfile

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+{
+	# Disable the Caddy admin API for security
+	admin off
+}
+
+# Main site block, listens on port 8001
+:5001 {
+	# Custom error handling for 502 Bad Gateway
+	handle_errors 502 {
+		root * /data                  # Serve files from /data
+		rewrite * /offline.html       # Rewrite all requests to offline.html
+		templates                     # Enable template processing
+		file_server                   # Serve static files
+	}
+	# Route for database web UI
+	route /dev/db/* {
+		uri strip_prefix /dev/db      # Remove /dev/db prefix
+		reverse_proxy 127.0.0.1:8081  # Proxy to DB UI on port 8081
+	}
+	# Default route: proxy all other requests to main app
+	route /* {
+		reverse_proxy 127.0.0.1:4000  # Proxy to main app 
+	}
+}