Add iPad support, auto-pinning, and comprehensive logging

- Adaptive iPhone/iPad layout with NavigationSplitView sidebar
- Auto-detect SSL-pinned domains, fall back to passthrough
- Certificate install via local HTTP server (Safari profile flow)
- App Group-backed CA, per-domain leaf cert LRU cache
- DB-backed config repository, Darwin notification throttling
- Rules engine, breakpoint rules, pinned domain tracking
- os.Logger instrumentation across tunnel/proxy/mitm/capture/cert/rules/db/ipc/ui
- Fix dyld framework embed, race conditions, thread safety

ProxyCore/Sources/Shared/NotificationThrottle.swift

@@ -0,0 +1,32 @@
+import Foundation
+
+/// Throttles Darwin notification posting to at most once per 0.5 seconds.
+/// Prevents flooding the main app with hundreds of "new traffic" notifications.
+public final class NotificationThrottle: @unchecked Sendable {
+    public static let shared = NotificationThrottle()
+
+    private let lock = NSLock()
+    private var pending = false
+    private let interval: TimeInterval = 0.5
+
+    private init() {}
+
+    public func throttle() {
+        lock.lock()
+        if pending {
+            lock.unlock()
+            ProxyLogger.ipc.debug("NotificationThrottle: suppressed newTraffic while pending")
+            return
+        }
+        pending = true
+        lock.unlock()
+
+        DispatchQueue.global().asyncAfter(deadline: .now() + interval) { [weak self] in
+            self?.lock.lock()
+            self?.pending = false
+            self?.lock.unlock()
+            ProxyLogger.ipc.debug("NotificationThrottle: emitting throttled newTraffic")
+            IPCManager.shared.post(.newTrafficCaptured)
+        }
+    }
+}