Initial commit: Core packages

odoo-bringout-oca-ocb-base/doc/BASE_ADDON.md

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+# Base Addon Deep Dive
+
+The `base` addon provides the foundation for all Odoo applications.
+
+## Key Models
+- `ir.model`, `ir.model.fields`: model metadata and fields registry.
+- `ir.ui.menu`, `ir.actions.*`: client actions and menu hierarchy.
+- `ir.config_parameter`: runtime configuration key/value store.
+- `ir.attachment`: binary attachments with filestore storage.
+- `res.users`, `res.groups`, `res.company`, `res.partner`, `res.currency`.
+
+```mermaid
+classDiagram
+  class ir_model
+  class ir_model_fields
+  class ir_ui_menu
+  class ir_actions
+  class ir_config_parameter
+  class ir_attachment
+  class res_users
+  class res_groups
+  class res_company
+  class res_partner
+  class res_currency
+
+  ir_model <.. ir_model_fields
+  res_users --> res_groups
+  res_users --> res_company
+  res_partner --> res_company
+  ir_ui_menu --> ir_actions
+  ir_attachment --> res_users
+```
+
+## Controllers
+- Minimal endpoints for attachments and common actions.
+
+## Security
+- Group definitions and default access rights via `ir.model.access.csv`.
+- Record rules for multi-company and user-specific data.
+
+## Data
+- Seed actions, menus, parameters, currencies, companies, languages.
+
+## Notes
+- Many application modules only extend these models via `_inherit`.