feat(auth): DEBUG-Auto-Login (Memoro-Pattern)

Bei lokalen Xcode-Run-Builds wird beim Start automatisch eingeloggt
wenn der Keychain leer ist. Spart das manuelle Login bei jedem
Re-Install via Xcode.

- Sources/Core/Auth/DebugCredentials.swift — #if DEBUG-gewrappte
  Founder-Credentials (tills95@gmail.com / Aa-123456789)
- Sources/Core/Auth/AuthClient+EnsureSignedIn.swift — Extension
  ensureSignedIn() prüft .signedOut → signIn() in DEBUG
- RootView.task ruft auth.ensureSignedIn() — Release-Builds No-Op
  (Release/TestFlight/App-Store bleiben unverändert, User muss
  manuell einloggen)

Pattern 1:1 von memoro-native (gleiches File-Layout +
Klassennamen).

Build 9 → 10.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

project.yml

@@ -55,7 +55,7 @@ targets:
       path: Sources/Resources/Info.plist
       properties:
         CFBundleShortVersionString: "0.1.0"
-        CFBundleVersion: "9"
+        CFBundleVersion: "10"
         CFBundleDevelopmentRegion: de
         CFBundleDisplayName: Cardecky
         LSApplicationCategoryType: "public.app-category.education"
@@ -111,7 +111,7 @@ targets:
       properties:
         CFBundleDisplayName: Als Karte speichern
         CFBundleShortVersionString: "0.1.0"
-        CFBundleVersion: "9"
+        CFBundleVersion: "10"
         NSExtension:
           NSExtensionPointIdentifier: com.apple.share-services
           NSExtensionPrincipalClass: $(PRODUCT_MODULE_NAME).ShareViewController
@@ -144,7 +144,7 @@ targets:
       properties:
         CFBundleDisplayName: Cardecky Widget
         CFBundleShortVersionString: "0.1.0"
-        CFBundleVersion: "9"
+        CFBundleVersion: "10"
         NSExtension:
           NSExtensionPointIdentifier: com.apple.widgetkit-extension
     entitlements: