feat(api): add tags to resource creation

Normalize tag names before attaching them, reject names that are too short
after sanitization, and return 404 when removing tags not attached to the
resource.

Adds a per-team unique tag-name index and migrates duplicate tags onto the
kept record before creating the constraint.

app/Http/Controllers/Api/ServicesController.php

@@ -352,6 +352,11 @@ class ServicesController extends Controller
             ], 422);
         }
 
+        $return = $this->validateTagsParameter($request);
+        if ($return instanceof JsonResponse) {
+            return $return;
+        }
+
         if (filled($request->type) && filled($request->docker_compose_raw)) {
             return response()->json([
                 'message' => 'You cannot provide both service type and docker_compose_raw. Use one or the other.',
@@ -533,6 +538,8 @@ class ServicesController extends Controller
                 'urls.*.url' => 'string|nullable',
                 'force_domain_override' => 'boolean',
                 'is_container_label_escape_enabled' => 'boolean',
+                'tags' => 'array|nullable',
+                'tags.*' => 'string|min:2',
             ];
             $validationMessages = [
                 'urls.*.array' => 'An item in the urls array has invalid fields. Only name and url fields are supported.',