feat(recipes): add recipe visibility and sharing features

- Implemented functionality to set recipe visibility (public/private) with appropriate checks for user permissions.
- Added ability to share recipes with other users, including validation for existing users and permissions.
- Introduced new DTOs for setting visibility and sharing recipes.
- Updated RecipesController and RecipesService to handle new endpoints for visibility and sharing.
- Enhanced inventory preview to consider user permissions and shared recipes.
- Updated front-end to support new sharing and visibility features, including UI changes for recipe detail and admin user management.

backend/src/users/users.controller.ts

@@ -14,6 +14,11 @@ class SetPremiumDto {
   isPremium: boolean;
 }
 
+class SetRecipeSharingDto {
+  @IsBoolean()
+  canShareRecipes: boolean;
+}
+
 class AdminCreateUserDto {
   @IsString()
   @MinLength(2)
@@ -113,6 +118,16 @@ export class UsersController {
     return { id: updated.id, username: updated.username, isPremium: updated.isPremium };
   }
 
+  @Roles('admin')
+  @Patch(':id/recipe-sharing')
+  async setRecipeSharing(
+    @Param('id', ParseIntPipe) id: number,
+    @Body() dto: SetRecipeSharingDto,
+  ) {
+    const updated = await this.usersService.setRecipeSharing(id, dto.canShareRecipes);
+    return { id: updated.id, username: updated.username, canShareRecipes: updated.canShareRecipes };
+  }
+
   @Roles('admin')
   @Post()
   async adminCreateUser(

backend/src/users/users.service.ts

@@ -25,7 +25,17 @@ export class UsersService {
 
   findAll() {
     return this.prisma.user.findMany({
-      select: { id: true, username: true, email: true, firstName: true, lastName: true, role: true, isPremium: true, createdAt: true },
+      select: {
+        id: true,
+        username: true,
+        email: true,
+        firstName: true,
+        lastName: true,
+        role: true,
+        isPremium: true,
+        canShareRecipes: true,
+        createdAt: true,
+      },
       orderBy: { username: 'asc' },
     });
   }
@@ -38,6 +48,10 @@ export class UsersService {
     return this.prisma.user.update({ where: { id }, data: { isPremium } });
   }
 
+  setRecipeSharing(id: number, canShareRecipes: boolean) {
+    return this.prisma.user.update({ where: { id }, data: { canShareRecipes } });
+  }
+
   async adminCreate(data: { username: string; email: string; password: string; role?: string }) {
     const existing = await this.prisma.user.findFirst({
       where: { OR: [{ username: data.username }, { email: data.email }] },