fix: harden tenant auth and quality gates

api/src/common/strict-validation.pipe.ts

@@ -0,0 +1,9 @@
+import { ValidationPipe } from '@nestjs/common';
+
+export const strictValidationPipe = new ValidationPipe({
+  transform: true,
+  whitelist: true,
+  forbidNonWhitelisted: true,
+  stopAtFirstError: false,
+  transformOptions: { enableImplicitConversion: false },
+});