feat: implement user guide documentation in multiple languages and add IPC infrastructure for UI components

docs/user-guide/en/database.md

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+# MariaDB Database Management
+
+Multi-PHP provides a comprehensive toolset for managing MariaDB databases, from GUI-based wizards to deep process monitoring.
+
+---
+
+## 📊 Database & User Management
+
+Multi-PHP gives you easy access to creating and managing MySQL/MariaDB databases and users:
+
+- **Create Database**: Quickly create a new database with its own name.
+- **Manage Users**: Create new database users, set passwords, and manage permissions.
+- **List Databases**: View all existing databases and their usage statistics.
+
+---
+
+## 🧙 MariaDB Import & Export Wizards
+
+Our intelligent wizards take the complexity out of moving data:
+
+### **Import Wizard (SQL/Archive)**
+- Select a `.sql`, `.zip`, or `.sql.gz` file.
+- Choose your target MariaDB server and database.
+- Multi-PHP handles the rest, automatically extracting files and importing data into the chosen DB.
+
+### **Export Wizard (Backup)**
+- Select the database you want to export.
+- Choose if you want to compress the file using Gzip (`.gz`).
+- Save the file to your desired location.
+
+---
+
+## 🕒 MariaDB Process Monitor
+
+Monitor your database's activity in real time. Our Process Monitor shows:
+- **Active Connections**: Who is currently connected to the database.
+- **SQL Queries**: The exact SQL being executed and how long it's taking.
+- **Kill Processes**: Instantly terminate any stuck or problematic database connections.
+
+> [!TIP]
+> Need a more traditional web-based interface? Go to the **"Tools"** menu and install **phpMyAdmin** with just one click.
+
+### 📖 Next Steps
+- [Learn how to manage Nginx & Apache Servers](./web-servers.md)
+- [Manage CLI and System Integration](./settings.md)
+- [Troubleshooting Common Issues](./troubleshooting.md)