Add Claude Code integration: shared config + Setup tab

- Shared servers.json at ~/.server-connections/ (GUI + Claude Code)
- Setup tab: one-click install of ssh.py, /ssh skill, SSH key
- Duplicate checks — safe to run multiple times
- tools/ssh.py + tools/skill-ssh.md bundled
- Updated README with integration docs (EN/RU/ZH)
- Deploy guide for new machines

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

gui/app.py

@@ -13,6 +13,7 @@ from gui.tabs.terminal_tab import TerminalTab
 from gui.tabs.files_tab import FilesTab
 from gui.tabs.info_tab import InfoTab
 from gui.tabs.keys_tab import KeysTab
+from gui.tabs.setup_tab import SetupTab
 
 
 class App(ctk.CTk):
@@ -63,6 +64,7 @@ class App(ctk.CTk):
         self.tabview.add("Files")
         self.tabview.add("Info")
         self.tabview.add("Keys")
+        self.tabview.add("Setup")
 
         self.terminal_tab = TerminalTab(self.tabview.tab("Terminal"), self.store)
         self.terminal_tab.pack(fill="both", expand=True)
@@ -76,6 +78,9 @@ class App(ctk.CTk):
         self.keys_tab = KeysTab(self.tabview.tab("Keys"), self.store)
         self.keys_tab.pack(fill="both", expand=True)
 
+        self.setup_tab = SetupTab(self.tabview.tab("Setup"), self.store)
+        self.setup_tab.pack(fill="both", expand=True)
+
     def _on_server_select(self, alias: str):
         self.terminal_tab.set_server(alias)
         self.files_tab.set_server(alias)