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>

CHANGELOG.md

@@ -0,0 +1,13 @@
+# Changelog
+
+## [1.0.0] - 2026-02-23
+
+### Added
+- Server CRUD (SSH, Telnet, RDP, MariaDB, MSSQL, PostgreSQL)
+- SSH Terminal with auto-sudo
+- SFTP file transfer with progress bar
+- SSH key management (generate, install, copy)
+- Background status monitoring (online/offline)
+- Dark theme (CustomTkinter)
+- Search and filter servers
+- Build scripts for Windows, Linux, macOS