feat: add Swift Package Manager (SPM) support for iOS

Add Package.swift files for:
- google_mlkit_commons: MLKitVision, MLImage, Common dependencies
- google_mlkit_pose_detection: MLKitPoseDetection, MLKitPoseDetectionCommon, MLKitVision, MLImage, Common dependencies

This resolves the Swift Package Manager migration warning and prepares
the plugins for future Flutter versions that will require SPM support.
Uses d-date/google-mlkit-swiftpm as the MLKit binary distribution.

Fixes issue #868

Author: arrrrny

packages/google_mlkit_commons/README.md

@@ -77,6 +77,41 @@ end
 
 Notice that the minimum `IPHONEOS_DEPLOYMENT_TARGET` is 15.5, you can set it to something newer but not older.
 
+#### Apple Silicon iOS Simulator (iOS 26+)
+
+Google's `GoogleMLKit/*` pods only ship `arm64-iphoneos` and `x86_64-iphonesimulator` slices and exclude `arm64` from simulator builds. On Apple Silicon Macs running iOS 26+ simulators (where Rosetta 2 is no longer the default for the iOS Simulator) this makes `flutter run` fail with `Unable to find a destination matching the provided destination specifier`. Issue tracked upstream by Google: https://issuetracker.google.com/issues/178965151.
+
+Until proper `arm64-iphonesimulator` slices are published, this plugin ships an **opt-in** Podfile helper that re-labels the existing arm64 device slice as iOS Simulator (the same `LC_BUILD_VERSION.platform` swap used by the well-known [`arm64-to-sim`](https://github.com/bogo/arm64-to-sim) tool) and strips the `EXCLUDED_ARCHS[sdk=iphonesimulator*] = arm64` from the generated xcconfigs.
+
+To enable it, add two lines to your iOS `Podfile`:
+
+```ruby
+# Near the top, after `require ... podhelper ...`:
+require File.expand_path(
+  '.symlinks/plugins/google_mlkit_commons/ios/scripts/apple_silicon_simulator',
+  __dir__,
+)
+
+post_install do |installer|
+  # ...your existing post_install code...
+
+  # Add this line at the end:
+  mlkit_apple_silicon_simulator_patch(installer)
+end
+```
+
+Then re-run `pod install`. The example app under `packages/example` is wired up this way.
+
+The helper only changes vendored binaries inside `Pods/` and the `EXCLUDED_ARCHS` line in pod-generated xcconfigs. Device builds and release builds are unaffected. Remove the two lines to revert.
+
+#### Swift Package Manager (SPM) Support
+
+This plugin supports Swift Package Manager for iOS, which is the recommended way to manage iOS dependencies in Flutter 3.44+. CocoaPods support is deprecated and will be removed in future Flutter versions.
+
+No additional configuration is needed - Flutter will automatically detect and use the `Package.swift` file when building for iOS. The plugin uses the community-maintained [d-date/google-mlkit-swiftpm](https://github.com/d-date/google-mlkit-swiftpm) package for ML Kit binary dependencies.
+
+For more information, see: https://docs.flutter.dev/packages-and-plugins/swift-package-manager/for-plugin-authors
+
 ### Android
 
 - minSdkVersion: 21

packages/google_mlkit_commons/ios/Package.swift

@@ -0,0 +1,36 @@
+// swift-tools-version:5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+// This Package.swift provides Swift Package Manager support for google_mlkit_commons.
+// See: https://docs.flutter.dev/packages-and-plugins/swift-package-manager/for-plugin-authors
+
+import PackageDescription
+
+let package = Package(
+    name: "google_mlkit_commons",
+    platforms: [
+        .iOS("15.5")
+    ],
+    products: [
+        .library(
+            name: "google_mlkit_commons",
+            targets: ["google_mlkit_commons"])
+    ],
+    dependencies: [
+        .package(
+            url: "https://github.com/d-date/google-mlkit-swiftpm",
+            from: "9.0.0"
+        )
+    ],
+    targets: [
+        .target(
+            name: "google_mlkit_commons",
+            dependencies: [
+                .product(name: "MLKitVision", package: "GoogleMLKitSwiftPM"),
+                .product(name: "MLImage", package: "GoogleMLKitSwiftPM"),
+                .product(name: "Common", package: "GoogleMLKitSwiftPM"),
+            ],
+            path: "Classes"
+        )
+    ]
+)

packages/google_mlkit_pose_detection/ios/Package.swift

@@ -0,0 +1,38 @@
+// swift-tools-version:5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+// This Package.swift provides Swift Package Manager support for google_mlkit_pose_detection.
+// See: https://docs.flutter.dev/packages-and-plugins/swift-package-manager/for-plugin-authors
+
+import PackageDescription
+
+let package = Package(
+    name: "google_mlkit_pose_detection",
+    platforms: [
+        .iOS("15.5")
+    ],
+    products: [
+        .library(
+            name: "google_mlkit_pose_detection",
+            targets: ["google_mlkit_pose_detection"])
+    ],
+    dependencies: [
+        .package(
+            url: "https://github.com/d-date/google-mlkit-swiftpm",
+            from: "9.0.0"
+        )
+    ],
+    targets: [
+        .target(
+            name: "google_mlkit_pose_detection",
+            dependencies: [
+                .product(name: "MLKitPoseDetection", package: "GoogleMLKitSwiftPM"),
+                .product(name: "MLKitPoseDetectionCommon", package: "GoogleMLKitSwiftPM"),
+                .product(name: "MLImage", package: "GoogleMLKitSwiftPM"),
+                .product(name: "MLKitVision", package: "GoogleMLKitSwiftPM"),
+                .product(name: "Common", package: "GoogleMLKitSwiftPM"),
+            ],
+            path: "Classes"
+        )
+    ]
+)