Phase 4.A.1: Live Activity + Dynamic Island für laufende Gassi-Tour

Neues Widget-Extension-Target BanYaroGoWidgetExtension:
- Bundle-ID app.banyaro.ios.BanYaroGoWidget
- NSExtensionPointIdentifier = com.apple.widgetkit-extension
- Synced root group + explizite Info.plist + Embed-Phase in App-Target
- Cross-Membership der Shared/WalkActivityAttributes.swift in beiden Targets

Shared/WalkActivityAttributes.swift:
- ActivityAttributes mit startedAt (fix)
- ContentState mit distanceMeters, elapsedSeconds, pointCount, isPaused, isAutoPaused

BanYaroGoWidget/WalkLiveActivity.swift:
- Lock-Screen-View: Pfote-Icon + Status-Pille (Live/Pause/Auto-Pause) +
  Stats-Spalten (Distanz/Dauer/Punkte)
- Dynamic Island compact: Pfote leading, Distanz trailing
- Dynamic Island minimal: nur Pfote
- Dynamic Island expanded: Distanz/Dauer/Status mit Pfote zentriert

WalkActivityController:
- @MainActor Facade um ActivityKit
- start() prüft areActivitiesEnabled, killt orphaned current, request mit Initial-State
- update() async via Task
- end() mit dismissalPolicy.immediate

TrackingView:
- .onChange(of: tracker.isTracking) → Start/End
- persistTicker (5s) → update
- .onChange(of: tracker.isPaused/isAutoPaused) → sofort update für saubere UX

BanYaroGo-Info.plist: NSSupportsLiveActivities = true

BanYaroGoWidget-Info.plist

@@ -0,0 +1,29 @@
+<?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>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Ban Yaro Go</string>
+	<key>CFBundleExecutable</key>
+	<string>$(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>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(MARKETING_VERSION)</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.widgetkit-extension</string>
+	</dict>
+</dict>
+</plist>