Add build system, versioning, releases, multilingual docs

- version.py with v1.0.0
- build.py (PyInstaller cross-platform build script)
- build.sh / build.bat for quick builds
- releases/ServerManager-v1.0.0-win-x64.exe (Windows x64 binary)
- README.md with docs in English, Russian, Chinese
- CHANGELOG.md

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

version.py

@@ -0,0 +1,6 @@
+"""Version info for ServerManager."""
+
+__version__ = "1.0.0"
+__app_name__ = "ServerManager"
+__author__ = "aibot777"
+__description__ = "Desktop GUI for managing remote servers"