feat: Implement SQLite database for team owner management, configuration, batch processing, and proxies, introducing new auto-add API and Accounts UI.

backend/internal/database/sqlite.go

@@ -943,6 +943,12 @@ func (d *DB) DeleteCodexProxy(id int64) error {
 	return err
 }
 
+// ClearCodexProxies 清空所有代理
+func (d *DB) ClearCodexProxies() error {
+	_, err := d.db.Exec("DELETE FROM codex_auth_proxies")
+	return err
+}
+
 // GetCodexProxyByID 获取指定 ID 的代理地址
 func (d *DB) GetCodexProxyByID(id int64) (string, error) {
 	var proxyURL string