📝 docs: Update default administrator account information and security recommendations in installation guides

docs/guide/installation/binary.md

@@ -309,6 +309,14 @@ ps aux | grep ppanel
 - **User Panel**: `http://your-server-ip:8080`
 - **Admin Panel**: `http://your-server-ip:8080/admin/`
 
+::: warning Default Credentials
+**Default Administrator Account**:
+- **Email**: `admin@ppanel.dev`
+- **Password**: `password`
+
+**Security**: Change the default credentials immediately after first login.
+:::
+
 ### Configure Firewall
 
 ```bash

docs/guide/installation/docker-compose.md

@@ -223,7 +223,11 @@ After successful installation, you can access:
 - **Admin Panel**: `http://your-server-ip:8080/admin/`
 
 ::: warning Default Credentials
-Please change the default admin password immediately after first login for security.
+**Default Administrator Account** (if not configured):
+- **Email**: `admin@ppanel.dev`
+- **Password**: `password`
+
+**Security**: Change the default credentials immediately after first login.
 :::
 
 ### Configure Reverse Proxy (Recommended)

docs/guide/installation/docker-run.md

@@ -232,6 +232,14 @@ docker volume rm ppanel-data
 ```
 :::
 
+::: warning Default Credentials
+**Default Administrator Account**:
+- **Email**: `admin@ppanel.dev`
+- **Password**: `password`
+
+**Security**: Change the default credentials immediately after first login.
+:::
+
 ## Upgrading
 
 Upgrade PPanel directly from the **Admin Dashboard**. On the dashboard homepage, you can check for new versions and upgrade with one click.