Admin: add 'show version' (#11079)

### What problem does this PR solve?

```
admin> show version;
show_version
+-----------------------+
| version               |
+-----------------------+
| v0.21.0-241-gc6cf58d5 |
+-----------------------+
admin> \q
Goodbye!

```

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

admin/server/admin_server.py

@@ -31,6 +31,7 @@ from config import load_configurations, SERVICE_CONFIGS
 from auth import init_default_admin, setup_auth
 from flask_session import Session
 from flask_login import LoginManager
+from common.versions import get_ragflow_version
 
 stop_event = threading.Event()
 
@@ -52,6 +53,7 @@ if __name__ == '__main__':
         os.environ.get("MAX_CONTENT_LENGTH", 1024 * 1024 * 1024)
     )
     Session(app)
+    logging.info(f'RAGFlow version: {get_ragflow_version()}')
     show_configs()
     login_manager = LoginManager()
     login_manager.init_app(app)

admin/server/routes.py

@@ -24,6 +24,7 @@ from responses import success_response, error_response
 from services import UserMgr, ServiceMgr, UserServiceMgr
 from roles import RoleMgr
 from api.common.exceptions import AdminException
+from common.versions import get_ragflow_version
 
 admin_bp = Blueprint('admin', __name__, url_prefix='/api/v1/admin')
 
@@ -369,3 +370,13 @@ def get_user_permission(user_name: str):
         return success_response(res)
     except Exception as e:
         return error_response(str(e), 500)
+
+@admin_bp.route('/version', methods=['GET'])
+@login_required
+@check_admin_auth
+def show_version():
+    try:
+        res = {"version": get_ragflow_version()}
+        return success_response(res)
+    except Exception as e:
+        return error_response(str(e), 500)