iMessage: Add remote attachment support for VM/SSH deployments

src/config/types.imessage.ts

@@ -14,6 +14,8 @@ export type IMessageAccountConfig = {
   cliPath?: string;
   /** Optional Messages db path override. */
   dbPath?: string;
+  /** Remote host for SCP when attachments live on a different machine (e.g., clawdbot@192.168.64.3). */
+  remoteHost?: string;
   /** Optional default send service (imessage|sms|auto). */
   service?: "imessage" | "sms" | "auto";
   /** Optional default region (used when sending SMS). */

src/config/zod-schema.providers-core.ts

@@ -367,6 +367,7 @@ export const IMessageAccountSchemaBase = z.object({
   configWrites: z.boolean().optional(),
   cliPath: ExecutableTokenSchema.optional(),
   dbPath: z.string().optional(),
+  remoteHost: z.string().optional(),
   service: z.union([z.literal("imessage"), z.literal("sms"), z.literal("auto")]).optional(),
   region: z.string().optional(),
   dmPolicy: DmPolicySchema.optional().default("pairing"),