chore: Rebrand auf ev.mana.cardecky

Apple-Developer-Portal-App-ID lautet ev.mana.cardecky (analog zur
Domain cardecky.mana.how). Alle Bundle-IDs, App-Group, Keychain-
Group, OSLog-Subsysteme, URL-Schemes, Widget-Kind, App-Intent-Phrases,
Marketing-Texte und Doku nachgezogen.

Bundle-IDs neu:
- Main: ev.mana.cardecky
- Widget: ev.mana.cardecky.widget
- Share: ev.mana.cardecky.share
- Tests: ev.mana.cardecky.tests / .uitests

App-Group: group.ev.mana.cardecky
Keychain-Access-Group: $(AppIdentifierPrefix)ev.mana.cardecky
OSLog-Subsystem: ev.mana.cardecky

AASA gleichzeitig in cards-Repo angepasst (Commit 21ec535) und
auf mana-server redeployed — Probe liefert appID
"QP3GLU8PH3.ev.mana.cardecky".

Plus: ShareExtension/Resources/Info.plist + entitlements werden
jetzt analog zu Widget-Resources gitignored (sind XcodeGen-generated).

35 Unit-Tests + 1 UI-Test grün, alle drei Targets bauen.

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

Sources/Core/Auth/AppConfig.swift

@@ -7,7 +7,7 @@ import ManaCore
 enum AppConfig {
     static let manaAppConfig: ManaAppConfig = DefaultManaAppConfig(
         authBaseURL: URL(string: "https://auth.mana.how")!,
-        keychainService: "ev.mana.cards",
+        keychainService: "ev.mana.cardecky",
         keychainAccessGroup: nil
     )