Implement multi-platform build system with pure Go support

- Introduced a comprehensive build system that supports multiple platforms (Linux, macOS, Windows, Android) using pure Go builds (`CGO_ENABLED=0`).
- Updated all build and test scripts to ensure compatibility with the new purego approach, allowing for dynamic loading of `libsecp256k1` at runtime.
- Added detailed documentation on the build process, platform detection, and deployment options.
- Enhanced CI/CD workflows to automate builds for all supported platforms and include necessary libraries in releases.
- Updated `.gitignore` to exclude build output files.
- Created new documentation files for deployment and multi-platform build summaries.

scripts/deploy.sh

@@ -159,9 +159,15 @@ build_application() {
     ./scripts/update-embedded-web.sh
     
     # Build the binary in the current directory
-    log_info "Building binary in current directory..."
+    log_info "Building binary in current directory (pure Go + purego)..."
     CGO_ENABLED=0 go build -o "$BINARY_NAME"
     
+    # Copy libsecp256k1.so next to the binary (optional, for runtime performance)
+    if [[ -f "pkg/crypto/p8k/libsecp256k1.so" ]]; then
+        cp pkg/crypto/p8k/libsecp256k1.so .
+        log_info "Copied libsecp256k1.so next to binary (runtime optional)"
+    fi
+    
     if [[ -f "./$BINARY_NAME" ]]; then
         log_success "ORLY relay built successfully"
     else
@@ -190,10 +196,16 @@ install_binary() {
     # Ensure GOBIN directory exists
     mkdir -p "$GOBIN"
     
-    # Copy binary
+    # Copy binary and library
     cp "./$BINARY_NAME" "$GOBIN/"
     chmod +x "$GOBIN/$BINARY_NAME"
     
+    # Copy library if it exists
+    if [[ -f "./libsecp256k1.so" ]]; then
+        cp "./libsecp256k1.so" "$GOBIN/"
+        log_info "Copied libsecp256k1.so to $GOBIN/"
+    fi
+    
     log_success "Binary installed to $GOBIN/$BINARY_NAME"
 }