[IMP] mail_gateway: Fine-tune default values for gateway behavior rel…

…ated to the current user

- Use OdooBot for webhooks instead of the current user, following the same logic as Odoo.
- Avoid automatically adding the current user as a member of a new gateway to prevent notifications for all messages. This is now an explicit configuration.

mail_gateway/models/mail_gateway.py

@@ -1,6 +1,6 @@
 # Copyright 2024 Dixmit
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
-from odoo import Command, api, fields, models, tools
+from odoo import api, fields, models, tools
 
 
 class MailGateway(models.Model):
@@ -25,12 +25,10 @@ class MailGateway(models.Model):
     )
     webhook_user_id = fields.Many2one(
         "res.users",
-        default=lambda self: self.env.user.id,
+        default=lambda self: self.env.ref("base.user_root"),
         help="User that will create the messages",
     )
-    member_ids = fields.Many2many(
-        "res.users", default=lambda self: [Command.link(self.env.user.id)]
-    )
+    member_ids = fields.Many2many("res.users")
     company_id = fields.Many2one(
         "res.company", default=lambda self: self.env.company.id
     )