refactor(archive): remove archive on provider switches/updates

- Remove file archiving when switching providers or updating current provider
- Keep archive functionality only for initial migration (one-time operation)
- Retain simple .bak backup for config.json on each save
- Simplify code by removing unnecessary archive operations from daily workflows

This change prevents unlimited archive growth while maintaining data safety through:
1. Initial migration archives for historical data preservation
2. Single .bak file for basic rollback capability
3. All provider configs stored in SSOT (config.json)

src-tauri/src/app_config.rs

@@ -107,7 +107,16 @@ impl MultiAppConfig {
     /// 保存配置到文件
     pub fn save(&self) -> Result<(), String> {
         let config_path = get_app_config_path();
-        write_json_file(&config_path, self)
+        // 先备份旧版（若存在）到 ~/.cc-switch/config.json.bak，再写入新内容
+        if config_path.exists() {
+            let backup_path = get_app_config_dir().join("config.json.bak");
+            if let Err(e) = copy_file(&config_path, &backup_path) {
+                log::warn!("备份 config.json 到 .bak 失败: {}", e);
+            }
+        }
+
+        write_json_file(&config_path, self)?;
+        Ok(())
     }
 
     /// 获取指定应用的管理器

src-tauri/src/commands.rs

@@ -97,12 +97,7 @@ pub async fn add_provider(
         match app_type {
             AppType::Claude => {
                 let settings_path = crate::config::get_claude_settings_path();
-                // 归档当前 live 文件
-                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);
+                // 直接写入（不做归档）
                 crate::config::write_json_file(&settings_path, &provider.settings_config)?;
             }
             AppType::Codex => {
@@ -112,13 +107,7 @@ pub async fn add_provider(
                     std::fs::create_dir_all(parent)
                         .map_err(|e| format!("创建 Codex 目录失败: {}", e))?;
                 }
-                // 归档当前 live 文件
-                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);
+                // 直接写入（不做归档）
                 let auth = provider
                     .settings_config
                     .get("auth")
@@ -190,12 +179,7 @@ pub async fn update_provider(
         match app_type {
             AppType::Claude => {
                 let settings_path = crate::config::get_claude_settings_path();
-                // 归档当前 live 文件
-                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);
+                // 直接写入（不做归档）
                 crate::config::write_json_file(&settings_path, &provider.settings_config)?;
             }
             AppType::Codex => {
@@ -205,13 +189,7 @@ pub async fn update_provider(
                     std::fs::create_dir_all(parent)
                         .map_err(|e| format!("创建 Codex 目录失败: {}", e))?;
                 }
-                // 归档当前 live 文件
-                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);
+                // 直接写入（不做归档）
 
                 let auth = provider
                     .settings_config
@@ -368,13 +346,7 @@ 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);
+            // 不做归档，直接写入
 
             // 写 auth.json（必需）
             let auth = provider
@@ -422,12 +394,7 @@ pub async fn switch_provider(
                 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);
+            // 不做归档，直接写入
             write_json_file(&settings_path, &provider.settings_config)?;
         }
     }

src-tauri/src/config.rs

@@ -88,6 +88,7 @@ pub fn archive_file(ts: u64, category: &str, src: &Path) -> Result<Option<PathBu
     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()