feat: M2 database migration runner with Phinx and initial schema

dev.sh

@@ -4,7 +4,10 @@ cd -- "$(CDPATH='' cd -- "$(dirname -- "$0")" && pwd)"
 cmd=${1:-}
 if [ "$#" -gt 0 ]; then shift; fi
 case "$cmd" in
-    migrate|seed) echo "$cmd unavailable until M2 (#12); #10 remains open" >&2; exit 1 ;;
+    migrate)
+        exec docker compose run --rm --no-deps -T --entrypoint sh app -c "vendor/bin/phinx migrate $*" ;;
+    seed)
+        exec docker compose run --rm --no-deps -T --entrypoint sh app -c "vendor/bin/phinx seed:run $*" ;;
     down)
         for arg do
             case "$arg" in