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/Livewire/Project/Shared/Tags.php

@@ -91,9 +91,7 @@ class Tags extends Component
             $this->authorize('update', $this->resource);
             $this->resource->tags()->detach($id);
             $found_more_tags = Tag::ownedByCurrentTeam()->find($id);
-            if ($found_more_tags && $found_more_tags->applications()->count() == 0 && $found_more_tags->services()->count() == 0) {
-                $found_more_tags->delete();
-            }
+            $found_more_tags?->deleteIfOrphaned();
             $this->refresh();
             $this->dispatch('success', 'Tag deleted.');
         } catch (\Exception $e) {