feat: 跨实例同步移植 WIP 检查点（第1轮+2a+2b+synced_servers）

从 Axolotl 移植跨实例同步子系统，当前进度：

- 第1轮：synced_options/files.rs + mod.rs 骨架，state 层补齐 SyncedOption/InstanceSyncedOptions/CanonicalValue/GameOptionKind 等

- 2a：game_options 的 api_types/options_file/catalog(10文件)

- 2b：game_options 除 resource_pack_options/local_settings_editor 外的全部（settings_editor/write_shared_settings/fullscreen/launch_overrides/instance_support/read_instance_changes/pack_updates/source_selection + locales/5文件）；State 补 synced_options_lock/game_locale_indexer/lock_synced_options

- synced_servers：6 文件全部搬入

- 35+20 处 sqlx::query! 宏改写为非宏 query+bind

已知未完成：synced_servers::operations 依赖 synced_options::instance_option_supported（属 orchestration，第5轮），当前编译不通。

packages/app-lib/src/api/instance/synced_options/mod.rs

@@ -0,0 +1,14 @@
+mod files;
+mod game_options;
+pub(in crate::api::instance) mod pending;
+
+const COMMAND_HISTORY_FILE: &str = "command_history.txt";
+const HOTBAR_FILE: &str = "hotbar.nbt";
+
+pub(super) use self::files::{
+    CheckpointStatus, begin_checkpoint, checkpoint, detach_link, ensure_link,
+    finish_checkpoint, finish_plain_checkpoint, instance_game_dir,
+    instance_is_running, instance_option_enabled, nbt_from_bytes, nbt_to_bytes,
+    option_can_apply_while_running, read_nbt_file, safe_instance_id,
+    sha1_bytes, sha1_file, sync_files_are_protected, synced_options_path,
+};