Fix missing ONNXRuntimeBinary target in Package.swift

Replace stale "ONNXRuntimeBinary" dependency (which doesn't exist) with
platform-conditional ONNXRuntimeiOSBinary/ONNXRuntimemacOSBinary targets.
This was preventing SPM from resolving the package graph.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sanchitmonga22

Package.swift

@@ -172,7 +172,8 @@ let package = Package(
                 "RunAnywhere",
                 "ONNXBackend",
                 "RABackendONNXBinary",
-                "ONNXRuntimeBinary",
+                .target(name: "ONNXRuntimeiOSBinary", condition: .when(platforms: [.iOS])),
+                .target(name: "ONNXRuntimemacOSBinary", condition: .when(platforms: [.macOS])),
             ],
             path: "sdk/runanywhere-swift/Sources/ONNXRuntime",
             exclude: ["include"],