docs(FR-2325): add RBAC Management documentation for all languages (#6534)

Resolves #6046 (FR-2325)

## Summary

- Add complete RBAC Management user manual documentation in 4 languages (EN, KO, JA, TH)
- Add language-specific screenshots for EN, KO, JA (9 screenshots each, 27 total); TH uses EN placeholders (Thai locale unavailable)
- Add RBAC terminology to [TERMINOLOGY.md](http://TERMINOLOGY.md)
- Add navigation entries in book.config.yaml
- Add RBAC cross-references in admin_menu and overview docs
- Fix sidebar label: "Administration" → actual i18n labels (Admin Settings / 관리자 설정 / 管理者設定 / การตั้งค่าผู้ดูแลระบบ)
- Fix cross-reference links: use `#rbac-management` anchor links with `<a id>` in rbac_management.md

## Documentation coverage

- Role list page with filtering and status tabs
- Create / Edit / Delete role workflows
- Role detail drawer (source, status, dates, description)
- Role Assignments tab (add/remove users)
- Permissions tab (add permissions with scope type, target, permission type, permission)

## Screenshots (9 per language)

| Screenshot | Description |
| --- | --- |
| `rbac_role_list_page.png` | Role list with filter and table |
| `rbac_create_role_modal.png` | Create Role modal |
| `rbac_role_detail_drawer.png` | Role detail drawer |
| `rbac_edit_role_modal.png` | Edit Role modal |
| `rbac_assignments_tab.png` | Role Assignments tab |
| `rbac_add_user_modal.png` | Add User modal |
| `rbac_remove_user_dialog.png` | Remove user confirmation |
| `rbac_permissions_tab.png` | Permissions tab |
| `rbac_add_permission_modal.png` | Add Permission modal |

## Test plan

- [ ] Verify screenshots render correctly in built documentation
- [ ] Verify cross-reference links work from admin_menu to rbac_management
- [ ] Check all 4 language versions have structural parity

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Author: ironAiken2

packages/backend.ai-webui-docs/TERMINOLOGY.md

@@ -138,6 +138,19 @@ Backend.AI's GPU virtualization technology that allows sharing a single physical
 
 **Do NOT use** "container" and "kernel" interchangeably. They refer to different concepts.
 
+### RBAC (Role-Based Access Control)
+
+| Term | EN | KO | JA | TH | Description |
+|------|----|----|----|----|-------------|
+| RBAC | RBAC | RBAC | RBAC | RBAC | Keep as abbreviation across all languages |
+| Role | role | 권한 | ロール | บทบาท | A named set of permissions assignable to users |
+| Permission | permission | 세부 권한 | 権限 | สิทธิ์ | A fine-grained access rule within a role |
+| Role Assignment | role assignment | 권한 할당 | ロール割り当て | การมอบหมายบทบาท | The association of a user to a role |
+| Scope Type | scope type | 적용 범위 타입 | スコープタイプ | ประเภทขอบเขต | The level at which a permission applies |
+| Permission Type | permission type | 권한 타입 | 権限タイプ | ประเภทสิทธิ์ | The category of resource a permission controls |
+
+**Note**: The Korean i18n uses "권한" for both "Role" and "Permission" in different contexts. "세부 권한" is used specifically for fine-grained permissions within a role. Always check `resources/i18n/ko.json` for the exact UI labels.
+
 ## User Roles
 
 | Role | EN | KO | JA | Scope |
@@ -158,6 +171,7 @@ These terms match sidebar menu items. Keep documentation references consistent w
 | Model Serving | 모델 서빙 | モデルサービス | model_serving/model_serving.md |
 | Statistics | 통계 | 統計 | statistics/statistics.md |
 | User Settings | 사용자 설정 | ユーザー設定 | user_settings/user_settings.md |
+| RBAC Management | RBAC 관리 | RBAC管理 | rbac_management/rbac_management.md |
 
 **Important**: Always check `resources/i18n/{lang}.json` in the main project for current UI label translations. The i18n files are the source of truth for UI labels.
 

packages/backend.ai-webui-docs/src/book.config.yaml

@@ -57,6 +57,8 @@ navigation:
       path: user_settings/user_settings.md
     - title: Cluster Session
       path: cluster_session/cluster_session.md
+    - title: RBAC Management
+      path: rbac_management/rbac_management.md
     - title: Admin Menu
       path: admin_menu/admin_menu.md
     - title: Trouble Shooting
@@ -114,6 +116,8 @@ navigation:
       path: user_settings/user_settings.md
     - title: クラスターセッション
       path: cluster_session/cluster_session.md
+    - title: RBAC管理
+      path: rbac_management/rbac_management.md
     - title: 管理者メニュー
       path: admin_menu/admin_menu.md
     - title: FAQ＆トラブルシューティング
@@ -171,6 +175,8 @@ navigation:
       path: user_settings/user_settings.md
     - title: 클러스터 세션
       path: cluster_session/cluster_session.md
+    - title: RBAC 관리
+      path: rbac_management/rbac_management.md
     - title: 관리자 메뉴
       path: admin_menu/admin_menu.md
     - title: FAQ 및 문제 해결
@@ -228,6 +234,8 @@ navigation:
       path: user_settings/user_settings.md
     - title: เซสชันคลัสเตอร์
       path: cluster_session/cluster_session.md
+    - title: การจัดการ RBAC
+      path: rbac_management/rbac_management.md
     - title: เมนูผู้ดูแลระบบ
       path: admin_menu/admin_menu.md
     - title: FAQ และการแก้ไขปัญหา

packages/backend.ai-webui-docs/src/en/admin_menu/admin_menu.md

@@ -1371,3 +1371,13 @@ This page is only for showing current information.
 :::
 
 ![](../images/information_page.png)
+
+## RBAC Management
+
+RBAC (Role-Based Access Control) Management allows superadmins to define roles with fine-grained permissions and assign them to users. You can control which actions specific users are allowed to perform on various resources throughout the Backend.AI system.
+
+:::note
+RBAC Management is only available to superadmins and requires Backend.AI Manager version 25.4.0 or later.
+:::
+
+For detailed information about managing roles, permissions, and user assignments, refer to the dedicated [RBAC Management](#rbac-management) page.

packages/backend.ai-webui-docs/src/en/overview/overview.md

@@ -188,4 +188,5 @@ achieves more intuitive use.
 | Resources* | X | O |
 | Configurations* | X | O |
 | Maintenance* | X | O |
-| Information* | X | O |
+| Information* | X | O |
+| RBAC Management* | X | O (superadmin) |