Add user ID support for Baileys 7 LIDs and Signal UUIDs

Baileys 7 uses LIDs (Linked IDs) instead of phone numbers in remoteJid for
some messages. This caused messages to be matched to wrong tickets because
the LID was used as the sender identifier. This commit adds proper support
for both phone numbers and user IDs across WhatsApp and Signal channels.

Changes:

Database:
- Add migration for whatsapp_user_id and signal_user_id fields on users table

Zammad controllers:
- Update user lookup with 3-step fallback: phone → dedicated user_id field →
  user_id in phone field (legacy)
- Store user IDs in dedicated fields when available
- Update phone field when we receive actual phone number for legacy records
- Fix redundant condition in Signal controller

Bridge services:
- Extract both phone (from senderPn/participantPn) and LID (from remoteJid)
- Send both identifiers to Zammad via webhooks
- Use camelCase (userId) in bridge-whatsapp, convert to snake_case (user_id)
  in bridge-worker for Zammad compatibility

Baileys 7 compliance:
- Remove broken loadAllUnreadMessages() call (removed in Baileys 7)
- Return descriptive error directing users to use webhooks instead

Misc:
- Add docs/ to .gitignore

packages/zammad-addon-bridge/src/app/controllers/channels_cdr_whatsapp_controller.rb

@@ -123,12 +123,16 @@ class ChannelsCdrWhatsappController < ApplicationController
     errors = {}
 
     %i[to
-       from
        message_id
        sent_at].each do |field|
       errors[field] = 'required' if params[field].blank?
     end
 
+    # At least one of from (phone) or user_id must be present
+    if params[:from].blank? && params[:user_id].blank?
+      errors[:from] = 'required (or user_id)'
+    end
+
     if errors.present?
       render json: {
         errors: errors
@@ -141,9 +145,25 @@ class ChannelsCdrWhatsappController < ApplicationController
     return if Ticket::Article.exists?(message_id: "cdr_whatsapp.#{message_id}")
 
     receiver_phone_number = params[:to].strip
-    sender_phone_number = params[:from].strip
-    customer = User.find_by(phone: sender_phone_number)
-    customer ||= User.find_by(mobile: sender_phone_number)
+    sender_phone_number = params[:from].present? ? params[:from].strip : nil
+    sender_user_id = params[:user_id].present? ? params[:user_id].strip : nil
+
+    # Lookup customer with fallback chain:
+    # 1. Phone number in phone/mobile fields (preferred)
+    # 2. WhatsApp user ID in whatsapp_user_id field
+    # 3. User ID in phone/mobile fields (legacy - we used to store LIDs there)
+    customer = nil
+    if sender_phone_number.present?
+      customer = User.find_by(phone: sender_phone_number)
+      customer ||= User.find_by(mobile: sender_phone_number)
+    end
+    if customer.nil? && sender_user_id.present?
+      customer = User.find_by(whatsapp_user_id: sender_user_id)
+      # Legacy fallback: user ID might be stored in phone field
+      customer ||= User.find_by(phone: sender_user_id)
+      customer ||= User.find_by(mobile: sender_user_id)
+    end
+
     unless customer
       role_ids = Role.signup_role_ids
       customer = User.create(
@@ -151,7 +171,8 @@ class ChannelsCdrWhatsappController < ApplicationController
         lastname: '',
         email: '',
         password: '',
-        phone: sender_phone_number,
+        phone: sender_phone_number.presence || sender_user_id,
+        whatsapp_user_id: sender_user_id,
         note: 'CDR Whatsapp',
         active: true,
         role_ids: role_ids,
@@ -160,6 +181,15 @@ class ChannelsCdrWhatsappController < ApplicationController
       )
     end
 
+    # Update whatsapp_user_id if we have it and customer doesn't
+    if sender_user_id.present? && customer.whatsapp_user_id.blank?
+      customer.update(whatsapp_user_id: sender_user_id)
+    end
+    # Update phone if we have it and customer only has user_id in phone field
+    if sender_phone_number.present? && customer.phone == sender_user_id
+      customer.update(phone: sender_phone_number)
+    end
+
     # set current user
     UserInfo.current_user_id = customer.id
     current_user_set(customer, 'token_auth')
@@ -188,7 +218,8 @@ class ChannelsCdrWhatsappController < ApplicationController
     attachment_data_base64 = params[:attachment]
     attachment_filename = params[:filename]
     attachment_mimetype = params[:mime_type]
-    title = "Message from #{sender_phone_number} at #{sent_at}"
+    sender_display = sender_phone_number.presence || sender_user_id
+    title = "Message from #{sender_display} at #{sent_at}"
     body = message
 
     # find ticket or create one
@@ -207,8 +238,9 @@ class ChannelsCdrWhatsappController < ApplicationController
         preferences: {
           channel_id: channel.id,
           cdr_whatsapp: {
-            bot_token: channel.options[:bot_token], # change to bot id
-            chat_id: sender_phone_number
+            bot_token: channel.options[:bot_token],
+            chat_id: sender_phone_number.presence || sender_user_id,
+            user_id: sender_user_id
           }
         }
       )
@@ -217,7 +249,7 @@ class ChannelsCdrWhatsappController < ApplicationController
     ticket.save!
 
     article_params = {
-      from: sender_phone_number,
+      from: sender_display,
       to: receiver_phone_number,
       sender_id: Ticket::Article::Sender.find_by(name: 'Customer').id,
       subject: title,
@@ -230,7 +262,8 @@ class ChannelsCdrWhatsappController < ApplicationController
         cdr_whatsapp: {
           timestamp: sent_at,
           message_id: message_id,
-          from: sender_phone_number
+          from: sender_phone_number,
+          user_id: sender_user_id
         }
       }
     }