fix(admin): use existing app config index in migration

server/admin/internal/modules/appconfig/service_test.go

@@ -18,7 +18,7 @@ func TestH5AppScopeSchemaMigrationCreatesScopedKeys(t *testing.T) {
 	for _, snippet := range []string{
 		"app_code VARCHAR(32) NOT NULL DEFAULT ''",
 		"is_deleted BOOLEAN NOT NULL DEFAULT FALSE",
-		"DROP INDEX uk_admin_app_configs_group_key",
+		"DROP INDEX idx_admin_app_config_group_key",
 		"uk_admin_app_config_app_group_key (app_code, `group`, `key`)",
 	} {
 		if !strings.Contains(sqlText, snippet) {

server/admin/migrations/086_app_config_app_scope.sql

@@ -6,6 +6,6 @@ SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci;
 ALTER TABLE admin_app_configs
   ADD COLUMN app_code VARCHAR(32) NOT NULL DEFAULT '' COMMENT '应用编码；空值仅表示迁移前的只读默认基线' AFTER id,
   ADD COLUMN is_deleted BOOLEAN NOT NULL DEFAULT FALSE COMMENT '当前 App 删除墓碑；用于屏蔽默认基线' AFTER description,
-  DROP INDEX uk_admin_app_configs_group_key,
+  DROP INDEX idx_admin_app_config_group_key,
   ADD UNIQUE KEY uk_admin_app_config_app_group_key (app_code, `group`, `key`),
   ADD KEY idx_admin_app_configs_app_group (app_code, `group`);