feat: add CampusScope request-level provider for data isolation

apps/server/src/common/campus-scope.middleware.ts

@@ -0,0 +1,13 @@
+import { Injectable, NestMiddleware } from '@nestjs/common';
+import { Request, Response, NextFunction } from 'express';
+import { CampusScope, CampusRequest } from './campus-scope';
+
+@Injectable()
+export class CampusScopeMiddleware implements NestMiddleware {
+  constructor(private readonly scope: CampusScope) {}
+
+  use(req: Request, _res: Response, next: NextFunction): void {
+    (req as CampusRequest).campusScope = this.scope;
+    next();
+  }
+}