Initial commit: Mail packages

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

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+# Models
+
+Detected core models and extensions in mass_mailing.
+
+```mermaid
+classDiagram
+    class ir_mail_server
+    class mailing_contact
+    class mailing_contact_subscription
+    class mailing_filter
+    class mailing_list
+    class mailing_mailing
+    class mailing_trace
+    class res_users
+    class ir_http
+    class ir_model
+    class link_tracker
+    class link_tracker_click
+    class mail_render_mixin
+    class mail_thread
+    class res_company
+    class res_config_settings
+    class res_partner
+    class utm_campaign
+    class utm_medium
+    class utm_source
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.