添加 Playwright E2E 测试及构建修复

- 修复 vite.config.mjs base 路径为 "./" 解决 file:// 协议加载失败
- 添加测试专用 mockDialog IPC 绕过原生文件选择对话框
- 重建 better-sqlite3 以适配 Electron 内嵌 Node ABI
- 新增 6 个 E2E 测试：模板增删改、批量生成、文件解析

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

electron/ipc/templateIpc.js

@@ -55,12 +55,19 @@ ipcMain.handle("template:parse", async (_, filePath) => {
   return callPython({ action: "parse_template", file_path: filePath });
 });
 
+let _mockDialogPath = null;
+if (process.env.NODE_ENV !== "production") {
+  ipcMain.handle("test:mockDialog", (_, p) => { _mockDialogPath = p; });
+}
+
 ipcMain.handle("file:select", async (_, filters = []) => {
+  if (_mockDialogPath) { const p = _mockDialogPath; _mockDialogPath = null; return p; }
   const result = await dialog.showOpenDialog({ filters, properties: ["openFile"] });
   return result.canceled ? null : result.filePaths[0];
 });
 
 ipcMain.handle("file:selectDir", async () => {
+  if (_mockDialogPath) { const p = _mockDialogPath; _mockDialogPath = null; return p; }
   const result = await dialog.showOpenDialog({ properties: ["openDirectory"] });
   return result.canceled ? null : result.filePaths[0];
 });