Remove BunPrebuilts from git tracking

- Remove entire mac/Resources/BunPrebuilts/ directory from git
- Add directory to .gitignore
- These binaries should be generated/downloaded during build process

.gitignore

@@ -106,5 +106,5 @@ web/vibetunnel
 server/vibetunnel-fwd
 /.build-tools
 
-# Bun prebuilt executables (too large for git)
-mac/Resources/BunPrebuilts/*/vibetunnel
+# Bun prebuilt executables (should be built during build process)
+mac/Resources/BunPrebuilts/

mac/Resources/BunPrebuilts/README.md

@@ -1,43 +0,0 @@
-# Bun Prebuilt Binaries
-
-This directory contains pre-built Bun executables and native modules for both architectures.
-
-## Directory Structure
-
-```
-BunPrebuilts/
-├── arm64/
-│   ├── vibetunnel      # Bun executable for Apple Silicon
-│   ├── pty.node        # Native module for Apple Silicon
-│   └── spawn-helper    # Helper binary for Apple Silicon
-└── x86_64/
-    ├── vibetunnel      # Bun executable for Intel
-    ├── pty.node        # Native module for Intel
-    └── spawn-helper    # Helper binary for Intel
-```
-
-## Building for Each Architecture
-
-### On Apple Silicon Mac:
-```bash
-cd web
-bun build-native.js
-cp native/vibetunnel ../mac/Resources/BunPrebuilts/arm64/
-cp native/pty.node ../mac/Resources/BunPrebuilts/arm64/
-cp native/spawn-helper ../mac/Resources/BunPrebuilts/arm64/
-```
-
-### On Intel Mac:
-```bash
-cd web
-bun build-native.js
-cp native/vibetunnel ../mac/Resources/BunPrebuilts/x86_64/
-cp native/pty.node ../mac/Resources/BunPrebuilts/x86_64/
-cp native/spawn-helper ../mac/Resources/BunPrebuilts/x86_64/
-```
-
-## Notes
-
-- These binaries are architecture-specific and cannot be made universal
-- The build script will use these pre-built binaries if available
-- If binaries are missing for an architecture, that architecture won't have Bun support