feat: import/export for config and backups

- Add export_config/import_config/export_backup/import_backup to ServerStore
- Add 4 buttons row in Setup tab UI with file dialogs
- Add i18n keys for EN/RU/ZH (16 keys each)

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

gui/tabs/setup_tab.py

@@ -5,6 +5,7 @@ Includes configuration path management and backup/restore.
 
 import os
 import threading
+from datetime import datetime
 from tkinter import filedialog, messagebox
 import customtkinter as ctk
 from core.claude_setup import check_status, install_all, install_ssh_script, install_skill, generate_ssh_key
@@ -171,6 +172,34 @@ class SetupTab(ctk.CTkFrame):
         )
         self.restore_btn.pack(side="left")
 
+        # Import/Export row
+        ie_row = ctk.CTkFrame(config_frame, fg_color="transparent")
+        ie_row.pack(fill="x", padx=15, pady=(0, 10))
+
+        self.export_config_btn = ctk.CTkButton(
+            ie_row, text=t("export_config"), width=120, fg_color="#6b7280",
+            command=self._export_config
+        )
+        self.export_config_btn.pack(side="left", padx=(0, 5))
+
+        self.import_config_btn = ctk.CTkButton(
+            ie_row, text=t("import_config"), width=120, fg_color="#6b7280",
+            command=self._import_config
+        )
+        self.import_config_btn.pack(side="left", padx=5)
+
+        self.export_backup_btn = ctk.CTkButton(
+            ie_row, text=t("export_backup"), width=120, fg_color="#6b7280",
+            command=self._export_backup
+        )
+        self.export_backup_btn.pack(side="left", padx=5)
+
+        self.import_backup_btn = ctk.CTkButton(
+            ie_row, text=t("import_backup"), width=120, fg_color="#6b7280",
+            command=self._import_backup
+        )
+        self.import_backup_btn.pack(side="left", padx=5)
+
         # Log
         self.log = ctk.CTkTextbox(self, height=150, font=ctk.CTkFont(family="Consolas", size=11), state="disabled")
         self.log.pack(fill="both", expand=True, padx=20, pady=(5, 20))
@@ -279,3 +308,69 @@ class SetupTab(ctk.CTkFrame):
         else:
             self._backup_menu.configure(values=[t("no_backups")])
             self._backup_var.set(t("no_backups"))
+
+    # ── Import / Export handlers ─────────────────────
+
+    def _export_config(self):
+        default_name = f"servers_export_{datetime.now().strftime('%Y-%m-%d')}.json"
+        path = filedialog.asksaveasfilename(
+            title=t("export_config_title"),
+            defaultextension=".json",
+            initialfile=default_name,
+            filetypes=[("JSON files", "*.json"), ("All files", "*.*")],
+        )
+        if not path:
+            return
+        try:
+            self.store.export_config(path)
+            self._log(t("export_config_ok").format(path=path))
+        except Exception as e:
+            self._log(t("export_config_failed").format(e=e))
+
+    def _import_config(self):
+        path = filedialog.askopenfilename(
+            title=t("import_config_title"),
+            filetypes=[("JSON files", "*.json"), ("All files", "*.*")],
+        )
+        if not path:
+            return
+        if not messagebox.askyesno(t("import_config_title"), t("import_config_confirm")):
+            return
+        try:
+            self.store.import_config(path)
+            self._log(t("import_config_ok").format(path=path))
+        except Exception as e:
+            self._log(t("import_config_failed").format(e=e))
+
+    def _export_backup(self):
+        selected = self._backup_var.get()
+        if not selected or selected in (t("select_backup"), t("no_backups")):
+            self._log(t("no_backup_selected"))
+            return
+        path = filedialog.asksaveasfilename(
+            title=t("export_backup_title"),
+            defaultextension=".json",
+            initialfile=selected,
+            filetypes=[("JSON files", "*.json"), ("All files", "*.*")],
+        )
+        if not path:
+            return
+        try:
+            self.store.export_backup(selected, path)
+            self._log(t("export_backup_ok").format(path=path))
+        except Exception as e:
+            self._log(t("export_backup_failed").format(e=e))
+
+    def _import_backup(self):
+        path = filedialog.askopenfilename(
+            title=t("import_backup_title"),
+            filetypes=[("JSON files", "*.json"), ("All files", "*.*")],
+        )
+        if not path:
+            return
+        try:
+            name = self.store.import_backup(path)
+            self._refresh_backups()
+            self._log(t("import_backup_ok").format(name=name))
+        except Exception as e:
+            self._log(t("import_backup_failed").format(e=e))