feat(backup): archive current live config before switching\n\n- Archive Claude settings.json and Codex auth.json/config.toml to ~/.cc-switch/archive/<ts>\n- Preserve user edits while centralizing SSOT in cc-switch config.json\n- Uses atomic writes for all subsequent updates

src-tauri/src/commands.rs

@@ -258,6 +258,14 @@ pub async fn switch_provider(
                     .map_err(|e| format!("创建 Codex 目录失败: {}", e))?;
             }
 
+            // 备份当前 live 文件到归档（单一数据源：以 cc-switch 配置为主，但保护用户手改历史）
+            let ts = std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .unwrap_or_default()
+                .as_secs();
+            let _ = crate::config::archive_file(ts, "codex", &auth_path);
+            let _ = crate::config::archive_file(ts, "codex", &config_path);
+
             // 写 auth.json（必需）
             let auth = provider
                 .settings_config
@@ -303,6 +311,13 @@ pub async fn switch_provider(
             if let Some(parent) = settings_path.parent() {
                 std::fs::create_dir_all(parent).map_err(|e| format!("创建目录失败: {}", e))?;
             }
+
+            // 备份当前 live 文件到归档
+            let ts = std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .unwrap_or_default()
+                .as_secs();
+            let _ = crate::config::archive_file(ts, "claude", &settings_path);
             write_json_file(&settings_path, &provider.settings_config)?;
         }
     }

src-tauri/src/config.rs

@@ -39,6 +39,55 @@ pub fn get_app_config_path() -> PathBuf {
     get_app_config_dir().join("config.json")
 }
 
+/// 归档根目录 ~/.cc-switch/archive
+pub fn get_archive_root() -> PathBuf {
+    get_app_config_dir().join("archive")
+}
+
+fn ensure_unique_path(mut dest: PathBuf) -> PathBuf {
+    if !dest.exists() {
+        return dest;
+    }
+    let file_name = dest
+        .file_stem()
+        .map(|s| s.to_string_lossy().to_string())
+        .unwrap_or_else(|| "file".into());
+    let ext = dest
+        .extension()
+        .map(|s| format!(".{}", s.to_string_lossy()))
+        .unwrap_or_default();
+    let parent = dest.parent().map(|p| p.to_path_buf()).unwrap_or_default();
+    for i in 2..1000 {
+        let mut candidate = parent.clone();
+        candidate.push(format!("{}-{}{}", file_name, i, ext));
+        if !candidate.exists() {
+            return candidate;
+        }
+    }
+    dest
+}
+
+/// 将现有文件归档到 `~/.cc-switch/archive/<ts>/<category>/` 下，返回归档路径
+pub fn archive_file(ts: u64, category: &str, src: &Path) -> Result<Option<PathBuf>, String> {
+    if !src.exists() {
+        return Ok(None);
+    }
+    let mut dest_dir = get_archive_root();
+    dest_dir.push(ts.to_string());
+    dest_dir.push(category);
+    fs::create_dir_all(&dest_dir).map_err(|e| format!("创建归档目录失败: {}", e))?;
+
+    let file_name = src
+        .file_name()
+        .map(|s| s.to_string_lossy().to_string())
+        .unwrap_or_else(|| "file".into());
+    let mut dest = dest_dir.join(file_name);
+    dest = ensure_unique_path(dest);
+
+    copy_file(src, &dest)?;
+    Ok(Some(dest))
+}
+
 /// 清理供应商名称，确保文件名安全
 pub fn sanitize_provider_name(name: &str) -> String {
     name.chars()