feat(portal): complete masterplan with deterministic budget simulator, RAG assistant, agency cross-tenant view and multi-tenant middleware

src/app/api/simulate/route.ts

@@ -0,0 +1,37 @@
+import { NextRequest } from 'next/server';
+
+export async function POST(req: NextRequest) {
+  const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL || 'https://supabase.4ventures.es';
+  const serviceKey = process.env.SUPABASE_SERVICE_ROLE_KEY || process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY || '';
+  const tenantId = process.env.DEFAULT_TENANT_ID || '0b3c5fc0-6901-4caf-b26a-b6a0201d8541';
+
+  try {
+    const body = await req.json();
+    const spend = parseFloat(body.spend || 1000);
+    const channel = body.channel || 'meta';
+
+    const res = await fetch(`${supabaseUrl}/rest/v1/rpc/simulate_budget`, {
+      method: 'POST',
+      headers: {
+        apikey: serviceKey,
+        Authorization: `Bearer ${serviceKey}`,
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({
+        p_tenant_id: tenantId,
+        p_additional_spend: spend,
+        p_target_channel: channel === 'blended' ? null : channel
+      })
+    });
+
+    if (res.ok) {
+      const data = await res.json();
+      return Response.json(data);
+    } else {
+      const err = await res.text();
+      return Response.json({ error: err }, { status: 500 });
+    }
+  } catch (e: any) {
+    return Response.json({ error: e.message }, { status: 500 });
+  }
+}