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/CONTROLLERS.md

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+# Controllers
+
+HTTP routes provided by this module.
+
+```mermaid
+sequenceDiagram
+    participant U as User/Client
+    participant C as Module Controllers
+    participant O as ORM/Views
+
+    U->>C: HTTP GET/POST (routes)
+    C->>O: ORM operations, render templates
+    O-->>U: HTML/JSON/PDF
+```
+
+Notes
+- See files in controllers/ for route definitions.