feat: Introduce default profile sections and fields, updating schema with isSystem and isSearchableOnly properties.

src/profile-fields/profile-sections.service.ts

@@ -1,4 +1,4 @@
-import { Injectable, NotFoundException, ConflictException } from '@nestjs/common';
+import { Injectable, NotFoundException, ConflictException, ForbiddenException } from '@nestjs/common';
 import { PrismaService } from '../prisma';
 import { CreateSectionDto, UpdateSectionDto, AssignSectionDto, UpdateAssignmentDto } from './dto';
 
@@ -143,6 +143,13 @@ export class ProfileSectionsService {
   async remove(id: string) {
     const section = await this.findOne(id);
 
+    // Check if this is a system section
+    if (section.isSystem) {
+      throw new ForbiddenException(
+        'Cannot delete system sections. You can only deactivate them.',
+      );
+    }
+
     // Check if section has any fields
     if (section._count.fields > 0) {
       throw new ConflictException(