Add env-based config, file size check, improved timeout handling, and model selection

Update skill install guide, fix language default, and improve installer

Add install script, skill file, and Desktop App setup guide

Remove model selection - only gemini-3-flash-preview available in Gemini CLI

Change default model from gemini-3-pro-preview to gemini-3-flash-preview

Revert -y flag back to --approval-mode yolo

Fix: use -y flag instead of --approval-mode for Gemini CLI compatibility

Add Claude Desktop App installation instructions

Apply --include-directories to all file-accepting tools

Add cross-platform support (macOS, Linux, Windows)

Initial release: Gemini MCP server for Claude Code