Guide users to configure server connection on first launch

**Description**:
Currently, when users launch the application for the first time, there is no clear entry point to configure server connection details (server address, port, authentication, etc.). Users must navigate to the settings menu to complete initial setup, which is not user-friendly for new users.

**Requirements**:
1. On first launch (or when no server configuration is detected), automatically display a configuration guide
2. The setup interface should include:
- Server address/URL input field
- Port number field (if applicable)
- Authentication fields (username/password, API key, etc. as needed)
- "Test Connection" button (optional but recommended)
- "Save & Continue" button
3. Upon successful configuration, proceed directly to the main interface
4. Provide "Skip" or "Configure Later" option with clear warning that some features may be limited

**Expected User Flow**:
```
First launch → Detect no configuration → Show setup guide → User enters details →
(Optional: test connection) → Save successful → Enter main interface
```