caddy: add sysctls for UDP buffer (QUIC/HTTP3 fix)

- net.core.rmem_max=67108864 (64MB)
- net.core.wmem_max=67108864 (64MB)
- fixes Caddy QUIC buffer warning (was 208KB, needed 7MB+)

compose.yaml

@@ -8,17 +8,21 @@ services:
     image: caddy
     container_name: caddy
     restart: unless-stopped
+    sysctls:
+      - net.core.rmem_max=67108864
+      - net.core.wmem_max=67108864
     extra_hosts:
       - "host.docker.internal:host-gateway"
     networks:
       - proxy_network
+    expose:
+      - 2019
     ports:
       - 80:80
       - 443:443/tcp
       - 443:443/udp
       - 8448:8448
-    expose:
-      - 2019
+      - 10.200.200.254:2019:2019
     volumes:
       - /app-config/caddy/data:/data
       - /app-config/caddy/Caddyfile:/etc/caddy/Caddyfile