request: Add "Start Minimized" option in Application Settings

[bruuhim]

Checklist

• I checked that this feature has not been requested before
• I checked that this feature is not in the "Not planned" list
• This feature will benefit the majority of users

Problem Description / Use Case

Currently there's no way to make Seanime start minimized/hidden when launched on boot. It always opens a visible window, disrupting the user's workflow.

Users who want Seanime running in the background (like Discord, Steam) have no built-in way to achieve this.

Proposed Solution

Add two toggles in Application Settings:

1. Automatic Startup: ON/OFF - Start Seanime when computer boots
2. Start Minimized: ON/OFF - When launched on startup, start in the background without opening a visible window

When both are enabled:

• App launches silently on boot
• Runs in the background/system tray
• User clicks the tray icon to open the UI when needed

This matches the behavior of Discord, Steam, and other background apps.