v1.2.0 + v1.3.0: Localization, About dialog, TOTP/2FA, stability improvements

v1.2.0:
- GUI localization (EN/RU/ZH) with language switcher and persistent selection
- About dialog (ⓘ) with app info, features, quick start guide
- core/i18n.py — internationalization module with t() function
- All GUI components translated via t() keys

v1.3.0:
- TOTP/2FA tab — Google Authenticator compatible codes with live 30s countdown,
  one-click copy, per-server secret management
- core/totp.py — TOTP module (pyotp, RFC 6238)
- core/logger.py — rotating file logger (5MB, 3 backups)
- Stronger Fernet encryption key with automatic migration from old key
- Thread-safe server store with locks, atomic writes, auto-restore on corruption
- Parallel status checks via ThreadPoolExecutor (up to 10 concurrent)
- SSH client: explicit channel cleanup, Unix key permissions
- Server dialog: port validation (1-65535), TOTP secret field
- Language change preserves active tab and server selection
- pyotp dependency added

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

core/claude_setup.py

@@ -1,16 +1,24 @@
 """
 Claude Code integration setup.
-Installs ssh.py, /ssh skill, SSH key — everything needed for Claude Code
-to manage servers via the shared servers.json.
+Installs ssh.py, encryption.py, /ssh skill, SSH key — everything needed
+for Claude Code to manage servers via the shared servers.json.
 """
 
 import os
+import sys
 import shutil
 
 SHARED_DIR = os.path.expanduser("~/.server-connections")
-PROJECT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-SSH_SCRIPT_SRC = os.path.join(PROJECT_DIR, "tools", "ssh.py")
-SKILL_SRC = os.path.join(PROJECT_DIR, "tools", "skill-ssh.md")
+
+# PyInstaller: bundled data is in sys._MEIPASS; otherwise use project dir
+if getattr(sys, "frozen", False) and hasattr(sys, "_MEIPASS"):
+    _BASE_DIR = sys._MEIPASS
+else:
+    _BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+SSH_SCRIPT_SRC = os.path.join(_BASE_DIR, "tools", "ssh.py")
+ENCRYPTION_SRC = os.path.join(_BASE_DIR, "core", "encryption.py")
+SKILL_SRC = os.path.join(_BASE_DIR, "tools", "skill-ssh.md")
 
 SKILL_DST_DIR = os.path.expanduser("~/.claude/commands")
 SKILL_DST = os.path.join(SKILL_DST_DIR, "ssh.md")
@@ -23,6 +31,7 @@ def check_status() -> dict:
         "shared_dir": os.path.exists(SHARED_DIR),
         "servers_json": os.path.exists(os.path.join(SHARED_DIR, "servers.json")),
         "ssh_script": os.path.exists(os.path.join(SHARED_DIR, "ssh.py")),
+        "encryption": os.path.exists(os.path.join(SHARED_DIR, "encryption.py")),
         "skill_installed": os.path.exists(SKILL_DST),
         "ssh_key_exists": os.path.exists(SSH_KEY_PATH),
         "ssh_key_pub": os.path.exists(SSH_KEY_PATH + ".pub"),
@@ -30,16 +39,31 @@ def check_status() -> dict:
 
 
 def install_ssh_script() -> str:
-    """Copy ssh.py to shared dir."""
+    """Copy ssh.py and encryption.py to shared dir."""
     os.makedirs(SHARED_DIR, exist_ok=True)
+    results = []
+
+    # Copy ssh.py
     dst = os.path.join(SHARED_DIR, "ssh.py")
     if os.path.exists(SSH_SCRIPT_SRC):
         shutil.copy2(SSH_SCRIPT_SRC, dst)
-        return f"ssh.py installed: {dst}"
-    # Fallback: check if already exists in shared dir
-    if os.path.exists(dst):
-        return f"ssh.py already exists: {dst}"
-    return "ERROR: ssh.py source not found"
+        results.append(f"ssh.py installed: {dst}")
+    elif os.path.exists(dst):
+        results.append(f"ssh.py already exists: {dst}")
+    else:
+        results.append("ERROR: ssh.py source not found")
+
+    # Copy encryption.py
+    enc_dst = os.path.join(SHARED_DIR, "encryption.py")
+    if os.path.exists(ENCRYPTION_SRC):
+        shutil.copy2(ENCRYPTION_SRC, enc_dst)
+        results.append(f"encryption.py installed: {enc_dst}")
+    elif os.path.exists(enc_dst):
+        results.append(f"encryption.py already exists: {enc_dst}")
+    else:
+        results.append("ERROR: encryption.py source not found")
+
+    return "\n".join(results)
 
 
 def install_skill() -> str: