Add oca-dms submodule with 10 DMS modules

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Co-Authored-By: Claude <noreply@anthropic.com>

odoo-bringout-oca-dms-dms/doc/MODELS.md

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+# Models
+
+Detected core models and extensions in dms.
+
+```mermaid
+classDiagram
+    class abstract_dms_mixin
+    class dms_access_group
+    class dms_category
+    class dms_directory
+    class dms_file
+    class dms_mixins_thumbnail
+    class dms_security_mixin
+    class dms_storage
+    class dms_tag
+    class base
+    class image_mixin
+    class ir_attachment
+    class mail_thread
+    class res_company
+    class res_config_settings
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.