tools/dev-deploy: long-lived dev environment behind host Caddy

A docker-compose stack that hosts postgres, redis, mailpit, backend,
gateway, and an app-routing Caddy. Reachable through the host Caddy at
https://www.galaxy.lan (static SPA) and https://api.galaxy.lan (REST +
gRPC). Coexists with tools/local-dev/ and tools/local-ci/ by giving
every name (compose project, container, network, volume) a distinct
galaxy-dev-* prefix.

State is persisted in named volumes; game-state lives under
${GALAXY_DEV_GAME_STATE_DIR:-$HOME/.galaxy-dev/game-state} so the
default works for a non-root runner without sudo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/dev-deploy/Caddyfile.dev

@@ -0,0 +1,25 @@
+# Application-routing Caddy for the long-lived dev environment.
+# Listens only on the `edge` Docker network; TLS termination and the
+# real `:80`/`:443` listeners belong to the host Caddy in front of us.
+#
+# `/srv/galaxy-ui` is mounted from the `galaxy-dev-ui-dist` named volume,
+# refreshed on every dev-deploy run.
+{
+    auto_https off
+}
+
+:80 {
+    @frontend host www.galaxy.lan
+    handle @frontend {
+        root * /srv/galaxy-ui
+        try_files {path} /index.html
+        file_server
+        encode zstd gzip
+    }
+
+    @api host api.galaxy.lan
+    handle @api {
+        reverse_proxy galaxy-api:8080
+    }
+}
+}