Initial commit: Mail packages

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

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+# Models
+
+Detected core models and extensions in test_mass_mailing.
+
+```mermaid
+classDiagram
+    class mailing_performance
+    class mailing_performance_blacklist
+    class mailing_test_blacklist
+    class mailing_test_customer
+    class mailing_test_optout
+    class mailing_test_partner
+    class mailing_test_partner_unstored
+    class mailing_test_simple
+    class mailing_test_utm
+    class utm_test_source_mixin
+    class utm_test_source_mixin_other
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.