feat: add caddy config

caddy/Caddyfile.example

@@ -0,0 +1,30 @@
+{
+	admin off
+	# acme_dns cloudflare {env.CLOUDFLARE_API_TOKEN}
+
+	log {
+		format console
+	}
+
+	servers {
+		trusted_proxies cloudflare
+		client_ip_headers Cf-Connecting-Ip
+	}
+}
+
+<DOMAIN> {
+	@backend path /api/* /mcp/*
+	handle @backend {
+		reverse_proxy beavergram-api:8080
+	}
+
+	handle {
+		root * /srv
+		try_files {path} /index.html
+		file_server
+	}
+}
+
+dev.<DOMAIN> {
+	reverse_proxy beavergram-frontend:5173
+}