feat(backend): activate posts feed with prisma + strict DI

backend/src/auth/types/auth-request.ts

@@ -0,0 +1,8 @@
+import { Request } from 'express';
+
+export interface AuthRequest extends Request {
+  user: {
+    id: string;
+    role: 'USER' | 'ADMIN' | 'MOD';
+  } | null;
+}

backend/src/posts/posts.module.ts

@@ -0,0 +1,14 @@
+import { Module } from '@nestjs/common';
+import { PostsController } from './posts.controller';
+import { PostsService } from './posts.service';
+import { PrismaModule } from '../prisma/prisma.module';
+import { PrismaService } from '../prisma/prisma.service';
+
+@Module({
+  imports: [
+    PrismaModule, // 👈 DAS ist der Schlüssel
+  ],
+  controllers: [PostsController],
+  providers: [PostsService, PrismaService,],
+})
+export class PostsModule {}

backend/src/prisma/prisma.module.ts

@@ -0,0 +1,9 @@
+import { Global, Module } from '@nestjs/common';
+import { PrismaService } from '../../prisma/prisma.service';
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {}