Initial commit: Mail packages

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

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+# Models
+
+Detected core models and extensions in im_livechat.
+
+```mermaid
+classDiagram
+    class chatbot_message
+    class chatbot_script
+    class chatbot_script_answer
+    class chatbot_script_step
+    class im_livechat_channel
+    class im_livechat_channel_rule
+    class mail_channel
+    class digest_digest
+    class mail_channel_member
+    class mail_message
+    class rating_rating
+    class res_partner
+    class res_users
+    class res_users_settings
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.