feat: 重写为 Tauri + React + TypeScript (v4.0)

完全移除旧 C+IUP 代码，改用 Tauri 2.x + React 19 + TypeScript + Rust 技术栈重写。
功能与 v3.1 完全等价：

- React 前端：Tailwind CSS 4、Zustand 状态管理、i18next 国际化
- Rust 后端：winreg 注册表读写、Win32 API FFI 调用
- 核心逻辑：StringList、UndoRedoManager、PathManager、Import/Export
- 深色模式、中英文切换、键盘快捷键、合并预览
- 66 个 Vitest 单元测试

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/core/import-export.ts

@@ -0,0 +1,208 @@
+/**
+ * 导入导出模块 — 对应 C 版 import_export.c
+ * 支持 JSON、CSV、TXT 三种格式
+ */
+export type ExportFormat = 'json' | 'csv';
+
+export interface ExportData {
+  system: string[];
+  user: string[];
+}
+
+/** 根据文件扩展名检测格式 */
+export function detectExportFormat(filepath: string): ExportFormat {
+  if (filepath.toLowerCase().endsWith('.csv')) return 'csv';
+  return 'json';
+}
+
+// ── JSON 导出 ──
+
+export function exportToJson(data: ExportData): string {
+  const obj = {
+    version: '1.0',
+    type: 'PathEditor',
+    exported: new Date().toISOString(),
+    system: data.system,
+    user: data.user,
+  };
+  return JSON.stringify(obj, null, 2);
+}
+
+// ── CSV 导出 ──
+
+export function exportToCsv(data: ExportData): string {
+  const lines: string[] = [];
+  // UTF-8 BOM
+  lines.push('type,path');
+
+  for (const path of data.system) {
+    lines.push(`system,${escapeCsvField(path)}`);
+  }
+  for (const path of data.user) {
+    lines.push(`user,${escapeCsvField(path)}`);
+  }
+
+  return lines.join('\n') + '\n';
+}
+
+function escapeCsvField(field: string): string {
+  if (field.includes(',') || field.includes('"') || field.includes('\n')) {
+    return `"${field.replace(/"/g, '""')}"`;
+  }
+  return field;
+}
+
+// ── CSV 导入 ──
+
+export interface ImportResult {
+  system: string[];
+  user: string[];
+}
+
+export function importFromCsv(content: string): ImportResult {
+  const result: ImportResult = { system: [], user: [] };
+  const lines = content.split(/\r?\n/);
+
+  let hasHeader = false;
+
+  for (const rawLine of lines) {
+    // 跳过 BOM
+    let line = rawLine;
+    if (line.startsWith('')) {
+      line = line.slice(1);
+    }
+
+    if (line.trim() === '') continue;
+
+    const fields = parseCsvLine(line);
+    if (fields.length < 2) continue;
+
+    // 检测头部行
+    if (!hasHeader && isHeaderRow(fields[0], fields[1])) {
+      hasHeader = true;
+      continue;
+    }
+
+    const type = fields[0].trim().toLowerCase();
+    const path = fields[1].trim();
+
+    if (path.length === 0) continue;
+
+    if (type === 'system') {
+      result.system.push(path);
+    } else if (type === 'user') {
+      result.user.push(path);
+    }
+    // 未知类型忽略
+  }
+
+  return result;
+}
+
+function isHeaderRow(col0: string, col1: string): boolean {
+  const c0 = col0.trim().toLowerCase();
+  const c1 = col1.trim().toLowerCase();
+  return c0 === 'type' && c1 === 'path';
+}
+
+function parseCsvLine(line: string): string[] {
+  const fields: string[] = [];
+  let current = '';
+  let inQuotes = false;
+
+  for (let i = 0; i < line.length; i++) {
+    const ch = line[i];
+
+    if (inQuotes) {
+      if (ch === '"') {
+        if (i + 1 < line.length && line[i + 1] === '"') {
+          current += '"';
+          i++; // 跳过转义引号
+        } else {
+          inQuotes = false;
+        }
+      } else {
+        current += ch;
+      }
+    } else {
+      if (ch === '"') {
+        inQuotes = true;
+      } else if (ch === ',') {
+        fields.push(current);
+        current = '';
+      } else {
+        current += ch;
+      }
+    }
+  }
+
+  fields.push(current);
+  return fields;
+}
+
+// ── JSON 导入 ──
+
+export function importFromJson(content: string): ImportResult {
+  const result: ImportResult = { system: [], user: [] };
+
+  const obj = JSON.parse(content);
+
+  if (Array.isArray(obj.system)) {
+    result.system = obj.system.filter(
+      (p: unknown) => typeof p === 'string' && p.trim().length > 0,
+    );
+  }
+  if (Array.isArray(obj.user)) {
+    result.user = obj.user.filter(
+      (p: unknown) => typeof p === 'string' && p.trim().length > 0,
+    );
+  }
+
+  return result;
+}
+
+// ── TXT 导入 ──
+
+export function importFromTxt(content: string): string[] {
+  const paths: string[] = [];
+  const lines = content.split(/\r?\n/);
+
+  for (let line of lines) {
+    // 跳过 BOM
+    if (line.startsWith('')) line = line.slice(1);
+
+    const trimmed = line.trim();
+    if (trimmed.length === 0 || trimmed.startsWith('#')) continue;
+
+    paths.push(trimmed);
+  }
+
+  return paths;
+}
+
+// ── 自动检测导入 ──
+
+export function importFromContent(
+  content: string,
+  filepath: string,
+): ImportResult {
+  const ext = filepath.toLowerCase();
+  if (ext.endsWith('.csv')) {
+    return importFromCsv(content);
+  } else if (ext.endsWith('.json')) {
+    return importFromJson(content);
+  } else {
+    // TXT 文件：所有路径放入 system（用户后续可选择目标）
+    return { system: importFromTxt(content), user: [] };
+  }
+}
+
+/** 将 ImportResult 合并为单个路径数组 */
+export function flattenImportResult(
+  result: ImportResult,
+  target: 'system' | 'user' | 'both',
+): ExportData {
+  if (target === 'system') return { system: result.system, user: [] };
+  if (target === 'user') return { system: [], user: result.user };
+  return result; // both
+}