feat: M2 database migration runner with Phinx and initial schema

dev.ps1

@@ -4,9 +4,11 @@ $Command = if ($args.Count) { $args[0] } else { '' }
 $Forward = @($args | Select-Object -Skip 1)
 try {
     switch ($Command) {
-        { $_ -in 'migrate', 'seed' } {
-            [Console]::Error.WriteLine("$Command unavailable until M2 (#12); #10 remains open")
-            exit 1
+        'migrate' {
+            $ComposeArgs = @('run', '--rm', '--no-deps', '-T', '--entrypoint', 'sh', 'app', '-c', "vendor/bin/phinx migrate $($Forward -join ' ')")
+        }
+        'seed' {
+            $ComposeArgs = @('run', '--rm', '--no-deps', '-T', '--entrypoint', 'sh', 'app', '-c', "vendor/bin/phinx seed:run $($Forward -join ' ')")
         }
         'up' { $ComposeArgs = @('up', '-d', '--build') }
         'down' {