feat(api): add tag management endpoints for applications, databases, and services

Add CRUD tag endpoints (GET/POST/DELETE) as sub-resources for applications,
databases, and services. Add team-level GET /tags endpoint. Extend all
resource creation endpoints to accept an optional tags array.

Uses a shared HandlesTagsApi trait to avoid duplication across controllers.
Tags are race-safe via syncWithoutDetaching(), garbage-collected when orphaned,
and sanitized (strip_tags + lowercase).

app/Models/Tag.php

@@ -3,7 +3,18 @@
 namespace App\Models;
 
 use App\Traits\HasSafeStringAttribute;
+use OpenApi\Attributes as OA;
 
+#[OA\Schema(
+    description: 'Tag model',
+    type: 'object',
+    properties: [
+        new OA\Property(property: 'uuid', type: 'string'),
+        new OA\Property(property: 'name', type: 'string'),
+        new OA\Property(property: 'created_at', type: 'string'),
+        new OA\Property(property: 'updated_at', type: 'string'),
+    ]
+)]
 class Tag extends BaseModel
 {
     use HasSafeStringAttribute;