feat: enrich Settings → App Info with metadata & resource links (#56)

Replaces the three-row App Info screen with a full About/Resources/Support/
Legal layout, driven by a declarative AppInfoRow model with all URLs centralized
in one AppLinks namespace.

- About: Version now shows "5.0.0 (build N)" (CFBundleShortVersionString +
  CFBundleVersion), plus Storage, Backup Schema, and Minimum iOS (17.6).
- Resources: What's New (bundled ReleaseNotes.json sheet, no network),
  Documentation & FAQ, Source Code, Privacy Policy, and Acknowledgements
  ("no third-party dependencies" + MIT license).
- Support: Report an Issue (a sheet that shows the locally-assembled
  version/OS/device diagnostics before offering Email or GitHub — nothing is
  collected silently) and Contact (mailto).
- Support the App: Rate (SwiftUI's @Environment(\.requestReview), which handles
  the scene internally and respects Apple's throttling — the modern, safer
  equivalent of the issue's SKStoreReviewController + connectedScenes path) and
  Share (ShareLink to the App Store listing).
- Legal: copyright footer with the current year.

External rows use Link/openURL with an "opens outside the app" accessibility
hint; the screen is standard adaptive Form controls with semantic colors, so it
tracks Dynamic Type and light/dark automatically.

New files (AppLinks, AppInfo, ReleaseNotes[.swift/.json], AppInfoView) auto-
compile/bundle via the synchronized DomainDig/ group. AppInfoTests covers the
mailto builder, version format, diagnostics contents, and that the bundled notes
ship and parse. Unit suite green.

Placeholder pending the App Store listing: AppLinks.appStoreID (the review/share
URLs derive from it), flagged with a TODO.

1 files changed, 1 insertions, 23 deletions

diff --git a/DomainDig/SettingsViews.swift b/DomainDig/SettingsViews.swift
index a39639d..d93f6f9 100644
--- a/DomainDig/SettingsViews.swift
+++ b/DomainDig/SettingsViews.swift
@@ -105,7 +105,7 @@ struct SettingsView: View {
 
             Section("About") {
                 NavigationLink("App Info") {
-                    AboutSettingsView()
+                    AppInfoView()
                 }
             }
         }
@@ -1070,28 +1070,6 @@ private struct DataManagementSettingsView: View {
     }
 }
 
-private struct AboutSettingsView: View {
-    @State private var cloudSyncService = CloudSyncService.shared
-
-    private var appVersion: String {
-        AppVersion.current
-    }
-
-    var body: some View {
-        Form {
-            Section("About") {
-                LabeledContent("Version", value: appVersion)
-                LabeledContent("Storage", value: cloudSyncService.isEnabled ? "Local-first + iCloud" : "Local-only")
-                LabeledContent("Backup Schema", value: "v\(DomainDigBackup.currentSchemaVersion)")
-            }
-        }
-        .navigationTitle("App Info")
-        .task {
-            await cloudSyncService.refreshAvailability()
-        }
-    }
-}
-
 private struct DataImportPreviewSheet: View {
     @Environment(\.dismiss) private var dismiss