fix(macos): support password auth mode for gateway connections

GatewayChannel now sends both 'token' and 'password' fields in the auth
payload to support both authentication modes. Gateway checks the field
matching its auth.mode configuration ('token' or 'password').

Also adds config file password fallback for remote mode, allowing
gateway password to be configured in ~/.clawdis/clawdis.json without
requiring environment variables.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/gateway/hooks-mapping.ts

@@ -18,7 +18,7 @@ export type HookMappingResolved = {
   messageTemplate?: string;
   textTemplate?: string;
   deliver?: boolean;
-  channel?: "last" | "whatsapp" | "telegram" | "discord";
+  channel?: "last" | "whatsapp" | "telegram" | "discord" | "signal" | "imessage";
   to?: string;
   thinking?: string;
   timeoutSeconds?: number;
@@ -50,7 +50,7 @@ export type HookAction =
       wakeMode: "now" | "next-heartbeat";
       sessionKey?: string;
       deliver?: boolean;
-      channel?: "last" | "whatsapp" | "telegram" | "discord";
+      channel?: "last" | "whatsapp" | "telegram" | "discord" | "signal" | "imessage";
       to?: string;
       thinking?: string;
       timeoutSeconds?: number;