fix: rename form output bindings to avoid DOM event conflicts

Renamed @Output() properties in all form components from 'save' and
'cancel' to 'formSubmit' and 'formCancel' to resolve ESLint rule
@angular-eslint/no-output-native which prohibits output bindings
named after standard DOM events.

Updated all template bindings in detail components and admin
suggestions to use the new output names.

- Renamed save → formSubmit in all 6 form components
- Renamed cancel → formCancel in all 6 form components
- Updated bindings in 6 detail components
- Updated bindings in admin suggestions component

apps/frontend/src/app/components/music/music-detail.component.ts

@@ -31,8 +31,8 @@ import { Music, Comment, MusicStatus, MusicType, UpdateMusicDto } from '@library
         <app-music-form
           mode="edit"
           [music]="music()!"
-          (save)="saveEdit($event)"
-          (cancel)="cancelEdit()"
+          (formSubmit)="saveEdit($event)"
+          (formCancel)="cancelEdit()"
         ></app-music-form>
       }