feat: Add Bun binary compilation support

[davenforce]

Add Bun Binary Compilation Support

This PR adds the ability to compile the ms-365-mcp-server into standalone binaries that don't require Node.js
installation.

Changes

Binary Compilation:

• Added Bun build scripts for all platforms (macOS Intel/ARM, Linux x64/ARM64, Windows x64)
• Auto-generate embedded endpoints data during build (bin/embed-endpoints.mjs)
• Standalone binaries ~60MB each

Code Changes for Binary Compatibility:

• Made keytar optional with lazy loading and file-based fallback
• Embedded endpoints.json as TypeScript constant (no runtime file reads)
• Hardcoded version string (removed runtime package.json reads)
• Fixed logging to use stderr (stdout reserved for MCP protocol)
• Log files now write to ~/.ms365-mcp-server/logs/ (avoids permission issues)

Documentation:

• Updated README with binary installation option and build instructions
• Added binary build scripts to package.json (build:binary:*)
• Added prebuild hook to auto-generate embedded data

Build Commands

npm run build:binary:macos-arm # macOS Apple Silicon
npm run build:binary:macos # macOS Intel
npm run build:binary:linux # Linux x64
npm run build:binary:windows # Windows x64
npm run build:binary:all # All platforms

Why Binary Distribution?

• No Node.js installation required for end users
• Simpler deployment (single executable file)
• Smaller distribution size vs node_modules
• Better for non-technical users

Testing

• Binary compiles successfully
• Node.js version still works
• Logging works correctly (stderr output)
• Embedded endpoints load properly
• Optional keytar fallback works

[eirikb]

Hi there.

I've been thinking about this PR a lot.
I honestly don't know what to do about it.
The server already works with bun, I don't know if adding support for binary matters that much, and to how many.
If it was a small change sure, but it's not.
And then I think about how much effort has gone into it, if you have done a ton of work to make it work then I would be hard pressed to not accept, but from the looks of it it might just be some prompting? I just don't know what to do.