chore(xcode): add XcodeGen scaffold for device deployment

Adds project.yml (XcodeGen spec), Info.plist, entitlements, and
placeholder asset catalog so the project can be built in Xcode
and deployed to iPhone 14 via USB or wireless pairing.

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

SilverApple/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,13 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SilverApple/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SilverApple/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>$(DEVELOPMENT_LANGUAGE)</string>
+    <key>CFBundleDisplayName</key>
+    <string>SilverApple</string>
+    <key>CFBundleExecutable</key>
+    <string>$(EXECUTABLE_NAME)</string>
+    <key>CFBundleIdentifier</key>
+    <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>$(PRODUCT_NAME)</string>
+    <key>CFBundlePackageType</key>
+    <string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+    <key>CFBundleShortVersionString</key>
+    <string>0.1.0</string>
+    <key>CFBundleVersion</key>
+    <string>1</string>
+
+    <!-- OAuth PKCE callback scheme for ASWebAuthenticationSession -->
+    <key>CFBundleURLTypes</key>
+    <array>
+        <dict>
+            <key>CFBundleURLName</key>
+            <string>uk.silverlabs.silverapple.oauth</string>
+            <key>CFBundleURLSchemes</key>
+            <array>
+                <string>silverapple</string>
+            </array>
+        </dict>
+    </array>
+
+    <!-- Allow arbitrary HTTPS to user-configured SilverSHELL server -->
+    <key>NSAppTransportSecurity</key>
+    <dict>
+        <key>NSAllowsArbitraryLoads</key>
+        <false/>
+        <key>NSAllowsLocalNetworking</key>
+        <true/>
+    </dict>
+
+    <!-- Required iOS keys -->
+    <key>LSRequiresIPhoneOS</key>
+    <true/>
+    <key>UIApplicationSceneManifest</key>
+    <dict>
+        <key>UIApplicationSupportsMultipleScenes</key>
+        <false/>
+    </dict>
+    <key>UILaunchScreen</key>
+    <dict/>
+    <key>UISupportedInterfaceOrientations</key>
+    <array>
+        <string>UIInterfaceOrientationPortrait</string>
+    </array>
+</dict>
+</plist>

SilverApple/SilverApple.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <!-- Required by TokenStore.swift — Keychain-backed token storage -->
+    <key>keychain-access-groups</key>
+    <array>
+        <string>$(AppIdentifierPrefix)uk.silverlabs.silverapple</string>
+    </array>
+</dict>
+</plist>

project.yml

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+name: SilverApple
+
+options:
+  bundleIdPrefix: uk.silverlabs
+  deploymentTarget:
+    iOS: "16.0"
+  xcodeVersion: "15.0"
+  createIntermediateGroups: true
+  groupSortPosition: top
+
+settings:
+  base:
+    SWIFT_VERSION: "5.9"
+    DEVELOPMENT_TEAM: ""  # Fill in your Apple Developer Team ID before building
+    CODE_SIGN_STYLE: Automatic
+    ENABLE_BITCODE: false
+
+targets:
+  SilverApple:
+    type: application
+    platform: iOS
+    deploymentTarget: "16.0"
+    sources:
+      - path: SilverApple
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: uk.silverlabs.silverapple
+        INFOPLIST_FILE: SilverApple/Info.plist
+        CODE_SIGN_ENTITLEMENTS: SilverApple/SilverApple.entitlements
+        ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
+        TARGETED_DEVICE_FAMILY: "1"  # iPhone only
+    dependencies:
+      - framework: AuthenticationServices.framework
+        embed: false
+      - framework: SafariServices.framework
+        embed: false
+      - framework: Security.framework
+        embed: false
+
+  SilverAppleTests:
+    type: bundle.unit-test
+    platform: iOS
+    deploymentTarget: "16.0"
+    sources:
+      - path: SilverAppleTests
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: uk.silverlabs.silverapple.tests
+    dependencies:
+      - target: SilverApple