fix(mediarequest entity): narrow cascade to insert & remove to prevent hook recursion

Restrict cascade options on the MediaRequest→Media relation to only `insert` and `remove`to avoid
nested subscriber/AfterUpdate recursion when saving entities.

server/entity/Media.ts

@@ -108,7 +108,9 @@ class Media {
   @Column({ type: 'int', default: MediaStatus.UNKNOWN })
   public status4k: MediaStatus;
 
-  @OneToMany(() => MediaRequest, (request) => request.media, { cascade: true })
+  @OneToMany(() => MediaRequest, (request) => request.media, {
+    cascade: ['insert', 'remove'],
+  })
   public requests: MediaRequest[];
 
   @OneToMany(() => Watchlist, (watchlist) => watchlist.media)