v1.5.0: network interface binding, SSH fixes, terminal, release script

- Add network interface selection per server (VPN/multi-NIC support)
- Fix "Install Everything" button hanging on error
- Add interactive SSH terminal with PTY (pyte + xterm-256color)
- Add release.py for automated versioning and changelog generation
- Add CLAUDE.md with project instructions
- Add screenshots and release binaries for v1.1–v1.4

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

gui/app.py

@@ -34,7 +34,7 @@ class App(ctk.CTk):
 
         # Core
         self.store = ServerStore()
-        self.checker = StatusChecker(self.store, interval=60)
+        self.checker = StatusChecker(self.store)
 
         # Layout
         self._build_layout()
@@ -171,6 +171,9 @@ class App(ctk.CTk):
         # Use provided key or default to first tab
         current_key = restore_tab_key or self._tab_keys[0]
 
+        # Disconnect terminal before destroying tabs
+        self.terminal_tab._disconnect()
+
         # Detach tab contents
         self.terminal_tab.pack_forget()
         self.files_tab.pack_forget()
@@ -223,5 +226,6 @@ class App(ctk.CTk):
         self.sidebar.update_language()
 
     def _on_close(self):
+        self.terminal_tab._disconnect()
         self.checker.stop()
         self.destroy()