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

Caddyfile

@@ -0,0 +1,5 @@
+# Default profile: plain HTTP on :80, no TLS termination.
+# Used by: docker compose up -d
+:80 {
+	reverse_proxy app:8080
+}