AI Implementation feature(820): Project Scaffold and Platform Foundations (#1)

backend/src/common/pipes/zod-validation.pipe.ts

@@ -0,0 +1,17 @@
+import { PipeTransform, Injectable, ArgumentMetadata } from '@nestjs/common';
+import { ZodSchema } from 'zod';
+import { ApiError } from '../errors/api-error';
+
+@Injectable()
+export class ZodValidationPipe implements PipeTransform {
+  constructor(private readonly schema: ZodSchema) {}
+
+  transform(value: any, _metadata: ArgumentMetadata): any {
+    const parsed = this.schema.safeParse(value);
+    if (!parsed.success) {
+      const details = parsed.error.issues.map((i) => ({ path: i.path.join('.'), message: i.message }));
+      throw ApiError.validation('Request validation failed', details);
+    }
+    return parsed.data;
+  }
+}