feat(users): add block/unblock and delete from admin panel

- Migration 0004: adds is_active column to users table
- Backend: DELETE /users/:id endpoint + is_active field in UpdateUserDto
- Admin UI: block/unblock toggle and delete with confirmation on user detail
- Users list: shows "Bloqueado" badge for inactive users

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/users/users.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get, Patch, Param, Body, UseGuards, Req } from '@nestjs/common';
+import { Controller, Get, Patch, Delete, Param, Body, UseGuards, Req } from '@nestjs/common';
 import { ApiTags, ApiBearerAuth } from '@nestjs/swagger';
 import { UsersService } from './users.service';
 import { JwtAuthGuard } from '../auth/jwt-auth.guard';
@@ -48,4 +48,11 @@ export class UsersController {
   findById(@Param('id') id: string) {
     return this.users.findById(id);
   }
+
+  @Delete(':id')
+  @UseGuards(JwtAuthGuard)
+  @ApiBearerAuth()
+  deleteById(@Param('id') id: string) {
+    return this.users.deleteById(id);
+  }
 }

backend/src/users/users.service.ts

@@ -31,4 +31,8 @@ export class UsersService {
   updateFcmToken(id: string, fcm_token: string) {
     return this.prisma.users.update({ where: { id }, data: { fcm_token } });
   }
+
+  deleteById(id: string) {
+    return this.prisma.users.delete({ where: { id } });
+  }
 }