iOS: add Apple Watch companion message MVP (#20054)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 720791ae6b
Co-authored-by: mbelinky <132747814+mbelinky@users.noreply.github.com>
Co-authored-by: mbelinky <132747814+mbelinky@users.noreply.github.com>
Reviewed-by: @mbelinky

apps/shared/OpenClawKit/Sources/OpenClawKit/Capabilities.swift

@@ -7,6 +7,7 @@ public enum OpenClawCapability: String, Codable, Sendable {
     case voiceWake
     case location
     case device
+    case watch
     case photos
     case contacts
     case calendar

apps/shared/OpenClawKit/Sources/OpenClawKit/WatchCommands.swift

@@ -0,0 +1,52 @@
+import Foundation
+
+public enum OpenClawWatchCommand: String, Codable, Sendable {
+    case status = "watch.status"
+    case notify = "watch.notify"
+}
+
+public struct OpenClawWatchStatusPayload: Codable, Sendable, Equatable {
+    public var supported: Bool
+    public var paired: Bool
+    public var appInstalled: Bool
+    public var reachable: Bool
+    public var activationState: String
+
+    public init(
+        supported: Bool,
+        paired: Bool,
+        appInstalled: Bool,
+        reachable: Bool,
+        activationState: String)
+    {
+        self.supported = supported
+        self.paired = paired
+        self.appInstalled = appInstalled
+        self.reachable = reachable
+        self.activationState = activationState
+    }
+}
+
+public struct OpenClawWatchNotifyParams: Codable, Sendable, Equatable {
+    public var title: String
+    public var body: String
+    public var priority: OpenClawNotificationPriority?
+
+    public init(title: String, body: String, priority: OpenClawNotificationPriority? = nil) {
+        self.title = title
+        self.body = body
+        self.priority = priority
+    }
+}
+
+public struct OpenClawWatchNotifyPayload: Codable, Sendable, Equatable {
+    public var deliveredImmediately: Bool
+    public var queuedForDelivery: Bool
+    public var transport: String
+
+    public init(deliveredImmediately: Bool, queuedForDelivery: Bool, transport: String) {
+        self.deliveredImmediately = deliveredImmediately
+        self.queuedForDelivery = queuedForDelivery
+        self.transport = transport
+    }
+}