feat: comprehensive NixOS and home-manager configuration updates
This commit includes significant updates to the Nix configuration including: - Added common NixOS module with system packages - Updated home-manager configurations for various systems - Enhanced terminal programs including Claude Code integration - Updated LLM server configurations with new models - Improved btop configuration with custom package - Added opencode support with permission settings - Updated tmux and nvim configurations The changes introduce new features, update existing configurations, and improve the overall system setup.
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