feat(deploy): docker image, caddy, compose, e2e script

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMHQTtnQtQqL8muAXHr9kd

docker-compose.tls.yml

@@ -0,0 +1,9 @@
+# Override for the HTTPS/Let's Encrypt path.
+# Usage: docker compose -f docker-compose.yml -f docker-compose.tls.yml up -d
+# Requires DOMAIN and ACME_EMAIL to be set in .env.
+services:
+  caddy:
+    volumes:
+      - ./Caddyfile.tls:/etc/caddy/Caddyfile:ro
+      - caddy_data:/data
+      - caddy_config:/config