fix: harden gateway recovery diagnostics and media delivery

Harden gateway recovery diagnostics and media delivery.\n\n- Accept gateway send asVoice and map it to outbound audioAsVoice.\n- Preserve generated Swift protocol models for the gateway send schema.\n- Keep the broader recovery hardening for install/update/status/vector/TTS paths in one reviewed PR.\n\nProof:\n- Focused local gateway/outbound/update/status/doctor/sqlite-vec tests passed.\n- oxfmt --check and git diff --check passed.\n- Testbox OPENCLAW_TESTBOX=1 pnpm check:changed passed at 2f5ef650e97763a61ff43c28e61707db84c50060.\n- GitHub required checks are green at the merge SHA; the qa-lab parity gate is optional/surface-only and was still pending.

apps/macos/Sources/OpenClawProtocol/GatewayModels.swift

@@ -473,6 +473,7 @@ public struct SendParams: Codable, Sendable {
     public let message: String?
     public let mediaurl: String?
     public let mediaurls: [String]?
+    public let asvoice: Bool?
     public let gifplayback: Bool?
     public let channel: String?
     public let accountid: String?
@@ -487,6 +488,7 @@ public struct SendParams: Codable, Sendable {
         message: String?,
         mediaurl: String?,
         mediaurls: [String]?,
+        asvoice: Bool?,
         gifplayback: Bool?,
         channel: String?,
         accountid: String?,
@@ -500,6 +502,7 @@ public struct SendParams: Codable, Sendable {
         self.message = message
         self.mediaurl = mediaurl
         self.mediaurls = mediaurls
+        self.asvoice = asvoice
         self.gifplayback = gifplayback
         self.channel = channel
         self.accountid = accountid
@@ -515,6 +518,7 @@ public struct SendParams: Codable, Sendable {
         case message
         case mediaurl = "mediaUrl"
         case mediaurls = "mediaUrls"
+        case asvoice = "asVoice"
         case gifplayback = "gifPlayback"
         case channel
         case accountid = "accountId"