feat(backend): add follow/unfollow endpoints and live follower counts

backend/src/posts/posts.service.ts

@@ -28,10 +28,17 @@ export class PostsService {
         },
       },
       author: {
-        select: {
-          name: true,
-        },
+  select: {
+    name: true,
+    _count: {
+      select: {
+        followers: true,
+        following: true,
       },
+    },
+  },
+},
+
     } as const;
 
     // Sichtbarkeit

backend/src/users/users.service.ts

@@ -0,0 +1,23 @@
+async getUserProfile(userId: number) {
+  const [user, followersCount, followingCount] = await Promise.all([
+    this.prisma.user.findUnique({
+      where: { id: userId },
+      select: {
+        id: true,
+        name: true,
+      },
+    }),
+    this.prisma.follow.count({
+      where: { followingId: userId },
+    }),
+    this.prisma.follow.count({
+      where: { followerId: userId },
+    }),
+  ]);
+
+  return {
+    ...user,
+    followersCount,
+    followingCount,
+  };
+}