feat: Google Drive agency sync with auto folder match

Connect marketing@ once, match Drive folders to tenants by name,
list Drive in Activos, and mirror portal uploads to the linked folder.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/api/assets/drive/route.ts

@@ -0,0 +1,85 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { createClient } from '@/lib/supabase/server';
+import { isAgencyRole, userRole } from '@/lib/agency';
+import { resolveActiveTenant } from '@/lib/tenant-context';
+import {
+  getDriveDownloadUrl,
+  getTenantDriveFolderId,
+  listFilesInFolder,
+} from '@/lib/google-drive';
+
+export const dynamic = 'force-dynamic';
+
+/** GET — list Drive files for active tenant folder (or ?download=fileId). */
+export async function GET(req: NextRequest) {
+  const supabase = await createClient();
+  const {
+    data: { user },
+  } = await supabase.auth.getUser();
+  if (!user) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+  }
+
+  const ctx = await resolveActiveTenant(user);
+  if (!ctx.tenantId || ctx.portfolioWide) {
+    return NextResponse.json(
+      { error: 'Selecciona un cliente en Contexto' },
+      { status: 400 }
+    );
+  }
+
+  // Clients only see own tenant; agency via view cookie already in ctx
+  const agency = isAgencyRole(userRole(user));
+  if (!agency) {
+    // resolveActiveTenant already scopes to home tenant
+  }
+
+  const downloadId = req.nextUrl.searchParams.get('download')?.trim();
+  if (downloadId) {
+    try {
+      const url = await getDriveDownloadUrl(downloadId);
+      return NextResponse.json({ url });
+    } catch (e) {
+      return NextResponse.json(
+        { error: e instanceof Error ? e.message : 'download failed' },
+        { status: 500 }
+      );
+    }
+  }
+
+  const link = await getTenantDriveFolderId(ctx.tenantId);
+  if (!link) {
+    return NextResponse.json({
+      files: [],
+      linked: false,
+      warning:
+        'Sin carpeta Drive enlazada. Conecta marketing@ en Agencia y ejecuta auto-match.',
+    });
+  }
+
+  try {
+    const files = await listFilesInFolder(link.folderId);
+    return NextResponse.json({
+      linked: true,
+      folderId: link.folderId,
+      folderName: link.folderName,
+      files: files.map((f) => ({
+        id: f.id,
+        name: f.name,
+        mimeType: f.mimeType,
+        bytes: f.size ? Number(f.size) : null,
+        modifiedTime: f.modifiedTime,
+        webViewLink: f.webViewLink,
+        source: 'drive' as const,
+      })),
+    });
+  } catch (e) {
+    return NextResponse.json({
+      linked: true,
+      folderId: link.folderId,
+      folderName: link.folderName,
+      files: [],
+      warning: e instanceof Error ? e.message : 'Drive error',
+    });
+  }
+}