fix(migration): 修复表名 tenants → tenant（单数）

crates/erp-server/migration/src/m20260501_000100_seed_action_inbox_menu.rs

@@ -25,7 +25,7 @@ impl MigrationTrait for Migration {
                 (SELECT id FROM users WHERE tenant_id = t.id LIMIT 1),
                 (SELECT id FROM users WHERE tenant_id = t.id LIMIT 1),
                 1
-            FROM tenants t
+            FROM tenant t
             WHERE NOT EXISTS (
                 SELECT 1 FROM menus
                 WHERE path = '/health/action-inbox' AND tenant_id = t.id
@@ -38,7 +38,7 @@ impl MigrationTrait for Migration {
             r#"
             INSERT INTO role_permissions (role_id, permission_code, tenant_id)
             SELECT r.id, 'health.action-inbox.list', t.id
-            FROM tenants t
+            FROM tenant t
             JOIN roles r ON r.tenant_id = t.id AND r.code = 'admin'
             WHERE NOT EXISTS (
                 SELECT 1 FROM role_permissions rp