Initial commit — iOS share extension for filing Gitea issues

Two-target Xcode project (xcodegen spec). The GiteaIssue container app
holds the base URL + personal access token in a shared keychain group;
the GiteaIssueShare extension reads them, surfaces a repo picker (with
recents) and a title/notes form, then creates the issue, uploads the
screenshot as an asset, and patches the body to embed it inline.

Min iOS 26.0, signing team V3PF3M6B6U.

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

Shared/Settings.swift

@@ -0,0 +1,26 @@
+import Foundation
+
+enum AppSettings {
+    static let appGroup = "group.com.treytartt.GiteaIssue"
+
+    private static let baseURLKey = "gitea.baseURL"
+    private static let tokenKey = "gitea.token"
+
+    static var baseURL: String {
+        get { Keychain.read(baseURLKey) ?? "https://gitea.treytartt.com" }
+        set { Keychain.write(baseURLKey, value: newValue) }
+    }
+
+    static var token: String {
+        get { Keychain.read(tokenKey) ?? "" }
+        set { Keychain.write(tokenKey, value: newValue) }
+    }
+
+    static var isConfigured: Bool {
+        !token.isEmpty && URL(string: baseURL) != nil
+    }
+
+    static var sharedDefaults: UserDefaults {
+        UserDefaults(suiteName: appGroup) ?? .standard
+    }
+}