Enhance role-check system with stricter checks (#15392)

## Overview

This PR strengthens our permission system by introducing more granular
role-based access control across the platform.

## Changes

### New Permissions Added
- **Applications** - Control who can install and manage applications
- **Layouts** - Control who can customize page layouts and UI structure
- **AI** - Control access to AI features and agents
- **Upload File** - Separate permission for file uploads
- **Download File** - Separate permission for file downloads (frontend
visibility)

### Security Enhancements
- Implemented whitelist-based validation for workspace field updates
- Added explicit permission guards to core entity resolvers
- Enhanced ESLint rule to enforce permission checks on all mutations
- Created `CustomPermissionGuard` and `NoPermissionGuard` for better
code documentation

### Affected Components
- Core entity resolvers: webhooks, files, domains, applications,
layouts, postgres credentials
- Workspace update mutations now use whitelist validation
- Settings UI updated with new permission controls

### Developer Experience
- ESLint now catches missing permission guards during development
- Explicit guard markers make permission requirements clear in code
review
- Comprehensive test coverage for new permission logic

## Testing
- ✅ All TypeScript type checks pass
- ✅ ESLint validation passes
- ✅ New permission guards properly enforced
- ✅ Frontend UI displays new permissions correctly

## Migration Notes
Existing workspaces will need to assign the new permissions to roles as
needed. By default, all new permissions are set to `false` for non-admin
roles.

packages/twenty-server/src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.module.ts

@@ -1,12 +1,16 @@
 import { Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 
+import { PermissionsModule } from 'src/engine/metadata-modules/permissions/permissions.module';
 import { ServerlessFunctionLayerEntity } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.entity';
-import { ServerlessFunctionLayerService } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.service';
 import { ServerlessFunctionLayerResolver } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.resolver';
+import { ServerlessFunctionLayerService } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.service';
 
 @Module({
-  imports: [TypeOrmModule.forFeature([ServerlessFunctionLayerEntity])],
+  imports: [
+    PermissionsModule,
+    TypeOrmModule.forFeature([ServerlessFunctionLayerEntity]),
+  ],
   providers: [ServerlessFunctionLayerService, ServerlessFunctionLayerResolver],
   exports: [ServerlessFunctionLayerService],
 })

packages/twenty-server/src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.resolver.ts

@@ -1,12 +1,14 @@
 import { UseGuards } from '@nestjs/common';
 import { Args, Mutation, Resolver } from '@nestjs/graphql';
 
+import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
+import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorator';
+import { SettingsPermissionsGuard } from 'src/engine/guards/settings-permissions.guard';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
-import { ServerlessFunctionLayerService } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.service';
+import { PermissionFlagType } from 'src/engine/metadata-modules/permissions/constants/permission-flag-type.constants';
 import { CreateServerlessFunctionLayerInput } from 'src/engine/metadata-modules/serverless-function-layer/dtos/create-serverless-function-layer.input';
 import { ServerlessFunctionLayerDTO } from 'src/engine/metadata-modules/serverless-function-layer/dtos/serverless-function-layer.dto';
-import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorator';
-import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
+import { ServerlessFunctionLayerService } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.service';
 
 @UseGuards(WorkspaceAuthGuard)
 @Resolver()
@@ -16,6 +18,7 @@ export class ServerlessFunctionLayerResolver {
   ) {}
 
   @Mutation(() => ServerlessFunctionLayerDTO)
+  @UseGuards(SettingsPermissionsGuard(PermissionFlagType.WORKFLOWS))
   async createOneServerlessFunctionLayer(
     @Args()
     createServerlessFunctionLayerInput: CreateServerlessFunctionLayerInput,