feat: Add attachment support for Signal and WhatsApp channels

- Signal: Use base64Attachments field in signal-cli-rest-api
- WhatsApp: Implement Baileys attachment sending for images, videos, audio, and documents
- Both channels retrieve attachments from Zammad Store model
- Support multiple attachments per message

apps/bridge-worker/tasks/whatsapp/send-whatsapp-message.ts

@@ -1,18 +1,24 @@
 import { db } from "@link-stack/bridge-common";
 import { createLogger } from "@link-stack/logger";
 
-const logger = createLogger('bridge-worker-send-whatsapp-message');
+const logger = createLogger("bridge-worker-send-whatsapp-message");
 
 interface SendWhatsappMessageTaskOptions {
   token: string;
   to: string;
   message: any;
+  attachments?: Array<{
+    data: string;
+    filename: string;
+    mime_type: string;
+  }>;
 }
 
 const sendWhatsappMessageTask = async ({
   message,
   to,
   token,
+  attachments,
 }: SendWhatsappMessageTaskOptions): Promise<void> => {
   const bot = await db
     .selectFrom("WhatsappBot")
@@ -21,13 +27,38 @@ const sendWhatsappMessageTask = async ({
     .executeTakeFirstOrThrow();
 
   const url = `${process.env.BRIDGE_WHATSAPP_URL}/api/bots/${bot.id}/send`;
-  const params = { message, phoneNumber: to };
+  const params: any = { message, phoneNumber: to };
+
+  if (attachments && attachments.length > 0) {
+    params.attachments = attachments;
+    logger.debug(
+      {
+        attachmentCount: attachments.length,
+        attachmentNames: attachments.map((att) => att.filename),
+      },
+      "Sending WhatsApp message with attachments",
+    );
+  }
+
   try {
     const result = await fetch(url, {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify(params),
     });
+
+    if (!result.ok) {
+      const errorText = await result.text();
+      logger.error(
+        {
+          status: result.status,
+          errorText,
+          url,
+        },
+        "WhatsApp send failed",
+      );
+      throw new Error(`Failed to send message: ${result.status}`);
+    }
   } catch (error) {
     logger.error({ error });
     throw new Error("Failed to send message");