Remove bootstrap binary from release artifacts

- Bootstrap is embedded in main binary, separate file not needed
- Simplify release archives to contain only lambda-nat-proxy binary
- Reduce artifact size and user confusion
- Embed process unchanged - bootstrap still gets embedded during build

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dan-v

.github/workflows/build-and-release.yml

@@ -112,14 +112,11 @@ jobs:
         run: |
           mkdir -p build
           CGO_ENABLED=0 go build -a -installsuffix cgo -o build/lambda-nat-proxy ./cmd/lambda-nat-proxy
-          
-          # Copy bootstrap to build directory
-          cp cmd/lambda-nat-proxy/assets/bootstrap build/
 
       - name: Create archive
         run: |
           cd build
-          tar -czf lambda-nat-proxy-${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz lambda-nat-proxy bootstrap
+          tar -czf lambda-nat-proxy-${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz lambda-nat-proxy
           mv lambda-nat-proxy-${{ matrix.goos }}-${{ matrix.goarch }}.tar.gz ../
 
       - name: Upload build artifact