ζ-0 Setup: Repo-Skelett, iOS-Build grün, Healthz live

- project.yml mit Bundle ev.mana.zitare + Widget + ShareExt-Targets
- ManaSwiftCore (ManaCore + ManaTokens) + ManaSwiftUI (ManaAuthUI)
  als Package-Dependencies via path:
- Pure SwiftUI für Native-Surfaces, WKWebView nur für Lese-Tabs
  (Hybrid-Sonderfall vs cards/memoro/manaspur, dokumentiert im
  Playbook ZITARE_NATIVE_GREENFIELD.md)
- Theme: paper-Variant aus @mana/themes
- ZitareAPI.healthCheck via direct URLSession (öffentlicher
  Endpoint, kein AuthenticatedTransport-Gate)
- 6/6 AppConfigTests + 1/1 UI-Smoke grün auf iPhone 16e Simulator
- Live: zitare-api.mana.how/healthz → HTTP/2 200

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

ShareExtension/ShareViewController.swift

@@ -0,0 +1,58 @@
+import SwiftUI
+import UIKit
+import UniformTypeIdentifiers
+
+/// Phase ζ-4 Placeholder — Share-Extension „An Zitare schicken".
+///
+/// Aufgaben in ζ-4:
+///
+/// - Empfängt `NSExtensionActivationSupportsText` + `WebURL`.
+/// - SwiftUI-Sheet mit Quote-Preview, Source-URL, „Als Draft
+///   speichern"-Button.
+/// - POST an `https://zitare-api.mana.how/api/v1/share/receive`
+///   mit Envelope-Type `mana/text` (siehe `zitare/app-manifest.json`).
+/// - Bei Network-Failure: in `PendingShareStore` unter App-Group
+///   persistieren, die App synct beim nächsten Launch.
+///
+/// Erfordert ManaCore-Auth-Sharing über Keychain-Access-Group +
+/// App-Group. Auth-Bridge-Pattern aus cards-native (ShareExtension/)
+/// übernehmen, wenn ζ-4 startet.
+class ShareViewController: UIViewController {
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        let hosting = UIHostingController(
+            rootView: ShareRootView(onDone: { [weak self] in
+                self?.extensionContext?.completeRequest(returningItems: nil)
+            })
+        )
+        addChild(hosting)
+        view.addSubview(hosting.view)
+        hosting.view.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            hosting.view.topAnchor.constraint(equalTo: view.topAnchor),
+            hosting.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            hosting.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            hosting.view.trailingAnchor.constraint(equalTo: view.trailingAnchor)
+        ])
+        hosting.didMove(toParent: self)
+    }
+}
+
+struct ShareRootView: View {
+    let onDone: () -> Void
+
+    var body: some View {
+        VStack(spacing: 16) {
+            Image(systemName: "quote.opening")
+                .font(.system(size: 48))
+            Text("An Zitare schicken")
+                .font(.headline)
+            Text("ζ-4 — TODO: POST /api/v1/share/receive")
+                .font(.caption)
+                .foregroundStyle(.secondary)
+            Button("Schließen", action: onDone)
+                .buttonStyle(.borderedProminent)
+        }
+        .padding()
+    }
+}