Add iPhone target with shared data layer and persistent cache

Two-target restructure: shared sources (models, services, settings,
extensions, team logos) move into Shared/, consumed by both the
existing macOS menu bar app and a new iOS app. MainService no longer
imports AppKit — platform code attaches via a MainServiceObserver
protocol (MacObserverAdapter wires back to MenuManager / StatusItemManager
/ NotificationManager).

iPhone app is a single SwiftUI page mirroring the macOS menu (playoff
round + yesterday/today/tomorrow), with a gear-icon settings sheet
(display option + IndieAbout for license/changelog). Persistent JSON
snapshot in Application Support paints last-known data on cold launch;
"Updated …" header escalates secondary → orange (>5min) → red (>30min)
so staleness is visually unmistakable. Foreground polling, scenePhase
refresh, and pull-to-refresh; no notifications on iOS in v1.

Shared/Services/ApiService.swift

@@ -0,0 +1,42 @@
+//
+// ApiService.swift
+// IceGlass
+//
+// Copyright 2026 Rouslan Zenetl. All Rights Reserved.
+//
+
+import Foundation
+
+typealias ApiServiceCallback = (_ jsonData: Data, _ response: URLResponse) -> Void
+
+class ApiService: @unchecked Sendable {
+    private let logger = IceGlassLogger(
+        subsystem: Bundle.main.bundleIdentifier ?? "dev.rzen.indie.IceGlass",
+        category: "ApiService"
+    )
+
+    let url: URL
+    let callback: ApiServiceCallback
+
+    var previousFetchTime: Date = .distantPast
+
+    init(url: URL?, callback: @escaping ApiServiceCallback) {
+        guard let url = url else {
+            preconditionFailure("ApiService initialised with nil URL — caller bug.")
+        }
+        self.url = url
+        self.callback = callback
+    }
+
+    func fetch() async {
+        do {
+            let (data, response) = try await URLSession.shared.data(from: url)
+            logger.info("Polling: \(self.url)")
+            logger.debug("Previous: \(Date.now.timeIntervalSince(previousFetchTime).humanReadableTime())")
+            previousFetchTime = Date.now
+            callback(data, response)
+        } catch {
+            logger.error("Invalid response from \(self.url) \(error)")
+        }
+    }
+}