feat: initial commit for ipv64 DNS TUI client

- Implement modular Textual TUI (main, app, widgets, config, api_client)
- Integrate IPv64.net REST API client using httpx
- Support record listing, creation, in-place edit, and deletion
- Add flexible token resolution (.env, env export, interactive prompt)
- Add bilingual README (DE/EN) and project configuration

main.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+"""IPv64 DNS TUI Client
+Author:  Pascal Bouquet <pascal@ptbos.de>
+License: GNU General Public License v3.0 (GPL-3.0)
+Year:    2026
+"""
+
+from app import IPv64TUI
+from config import get_api_key
+
+
+def main():
+    api_key = get_api_key()
+    app = IPv64TUI(api_key=api_key)
+    app.run()
+
+
+if __name__ == "__main__":
+    main()