feat: 快捷键录入重绑（FR-K3，keymap:load/save IPC+config.json，SettingsPanel 录入 UI+冲突检测，use-hotkeys 读 store 实时生效，重开恢复）

packages/shared/src/types/ipc.ts

@@ -29,6 +29,8 @@ export const IPC = {
   printPdf: 'doc:print-pdf',
   appearanceLoad: 'appearance:load',
   appearanceSave: 'appearance:save',
+  keymapLoad: 'keymap:load',
+  keymapSave: 'keymap:save',
 } as const;
 export type IpcChannel = (typeof IPC)[keyof typeof IPC];
 
@@ -58,6 +60,8 @@ export interface IpcMap {
   [IPC.printPdf]: { args: void; result: void };
   [IPC.appearanceLoad]: { args: void; result: { themeId: string; params: Record<string, unknown>; effect: string } | null };
   [IPC.appearanceSave]: { args: { themeId: string; params: Record<string, unknown>; effect: string }; result: void };
+  [IPC.keymapLoad]: { args: void; result: { id: string; combo: string }[] | null };
+  [IPC.keymapSave]: { args: { id: string; combo: string }[]; result: void };
 }
 
 // 类型安全的 invoke 帮助器签名（preload 暴露 + 渲染层使用）