Initial commit: Mail packages

odoo-bringout-oca-ocb-mass_mailing_sms/doc/MODELS.md

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+# Models
+
+Detected core models and extensions in mass_mailing_sms.
+
+```mermaid
+classDiagram
+    class mailing_contact
+    class res_users
+    class mailing_list
+    class mailing_mailing
+    class mailing_trace
+    class utm_campaign
+    class utm_medium
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.