refactor(helpers): extract STANDALONE_DATABASE_MODELS registry, add tests

Replace 8× repeated per-type if-blocks in `queryDatabaseByUuidWithinTeam`
and `queryResourcesByUuid` with a single loop over the new
`STANDALONE_DATABASE_MODELS` constant.

Add unit tests to guard the registry against drift (keys mirror
`DATABASE_TYPES`, every entry is a valid Eloquent model with `team()`),
and feature tests covering team-ownership, wrong-team, and unknown-UUID
cases for `queryDatabaseByUuidWithinTeam`.

tests/Unit/StandaloneDatabaseRegistryTest.php

@@ -0,0 +1,45 @@
+<?php
+
+use App\Models\StandaloneDocker;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * Guards STANDALONE_DATABASE_MODELS against drift.
+ *
+ * MCP and API endpoints rely on this registry for team-scoped UUID lookups.
+ * If a new App\Models\Standalone* model lands without a registry entry, the
+ * helpers in bootstrap/helpers/shared.php silently fail to resolve it.
+ */
+test('STANDALONE_DATABASE_MODELS contains every Standalone* model on disk', function () {
+    $files = glob(dirname(__DIR__, 2).'/app/Models/Standalone*.php');
+    expect($files)->not->toBeEmpty();
+
+    $onDisk = collect($files)
+        ->map(fn (string $path) => 'App\\Models\\'.basename($path, '.php'))
+        ->reject(fn (string $class) => $class === StandaloneDocker::class)
+        ->sort()
+        ->values()
+        ->all();
+
+    $registered = collect(STANDALONE_DATABASE_MODELS)->values()->sort()->values()->all();
+
+    expect($registered)->toBe(
+        $onDisk,
+        'STANDALONE_DATABASE_MODELS in bootstrap/helpers/constants.php is out of sync with the App\\Models\\Standalone* classes on disk. '
+        .'Add the missing model(s) to the registry (and to DATABASE_TYPES) so MCP/API helpers can resolve them.'
+    );
+});
+
+test('STANDALONE_DATABASE_MODELS keys mirror DATABASE_TYPES', function () {
+    expect(array_keys(STANDALONE_DATABASE_MODELS))->toEqualCanonicalizing(DATABASE_TYPES);
+});
+
+test('every STANDALONE_DATABASE_MODELS entry is an Eloquent model with whereUuid scope', function () {
+    foreach (STANDALONE_DATABASE_MODELS as $slug => $modelClass) {
+        expect(class_exists($modelClass))->toBeTrue("{$slug} maps to non-existent class {$modelClass}");
+        expect(is_subclass_of($modelClass, Model::class))
+            ->toBeTrue("{$modelClass} is not an Eloquent model");
+        expect(method_exists($modelClass, 'team'))
+            ->toBeTrue("{$modelClass} is missing team() accessor required by queryDatabaseByUuidWithinTeam()");
+    }
+});