🚀 Initialize Musadaq SaaS: Full Backend + AI + React Dashboard + Docker Setup

backend/src/common/middleware/tenant.middleware.ts

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+/**
+ * ════════════════════════════════════════════════════════════
+ * مُصادَق (Musadaq) — Tenant Middleware
+ * ════════════════════════════════════════════════════════════
+ * يستخرج tenantId من JWT ويضعه في request.
+ * يستخدم في تصفية البيانات (Query filtering).
+ * ════════════════════════════════════════════════════════════
+ */
+
+import {
+  Injectable,
+  NestMiddleware,
+  UnauthorizedException,
+} from '@nestjs/common';
+import { Request, Response, NextFunction } from 'express';
+
+@Injectable()
+export class TenantMiddleware implements NestMiddleware {
+  use(req: Request, res: Response, next: NextFunction) {
+    const { user } = req as any;
+
+    if (!user || !user.tenantId) {
+      // Phase 1: Not always required (registration, login)
+      return next();
+    }
+
+    // Set tenant context for the request
+    (req as any).tenantId = user.tenantId;
+    
+    next();
+  }
+}