Add native iOS app with App Store preparation

iOS app (ios/, SwiftUI, iOS 17+) in the web UI's styling with the Kamon
logo. It covers everything the web interface does except password, API
tokens and backups: dashboard, peers with search and filter, peer detail
with traffic charts, add/edit peers, one-time config with QR code and
share sheet, server settings with apply bar, app settings, data
retention and log viewer.

- Pairing by QR code or pasted pairing code; token kept in the keychain;
  self-signed certificates are pinned by SHA-256 fingerprint.
- Colour providers and logo drawing are nonisolated: SwiftUI's background
  renderer calls them, and main-actor closures crashed there when the
  camera scanner was open.
- App Store: version 1.0, export compliance, privacy manifest, app icon,
  release.sh (archive and upload), listing text, review notes and 6.9"
  screenshots in ios/AppStore.

Server:
- Full-access API tokens may use settings, logs and restart; password,
  tokens, backup/restore and the admin username stay admin-only.
- Web pairing dialog gains "Copy pairing code".
- The development simulator reports health checks in Linux wording.

Claude-Session: https://claude.ai/code/session_01RAnLbyQZ5ZTA7KqwXP98nw

ios/ExportOptions.plist

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>method</key>
+	<string>app-store-connect</string>
+	<key>destination</key>
+	<string>__DEST__</string>
+	<key>signingStyle</key>
+	<string>automatic</string>
+	<key>teamID</key>
+	<string>__TEAM_ID__</string>
+	<key>uploadSymbols</key>
+	<true/>
+	<key>manageAppVersionAndBuildNumber</key>
+	<false/>
+</dict>
+</plist>