Add Indiepass Launcher to NSL #911

💭 Is your feature request related to a problem?

A clear and concise description of what the problem is.
Example:

Requesting Indiepass Launcher added to Non Steam Launcher (https://www.indiepass.com/)

🚀 Describe the Solution You’d Like

A clear and concise description of what you’d like to see added or improved.
Example:

Add Indiepass Launcher to the list of available launchers.

🔄 Describe Alternatives You’ve Considered

List any alternative approaches, workarounds, or existing tools you’ve tried.
Example:

Tried launching with Bottles and adding to Steam as a non Steam game, able to login on a browser, but not had back the login token to the launcher.

🧩 Scope of Feature

Please indicate what area of NSL your request affects:

• Desktop (NonSteamLaunchers.desktop)
• Decky Plugin (NonSteamLaunchersDecky)
• Proton / Compatibility Integration
• UI / User Experience
• Other (please specify below)
  Additional Launcher

🧰 System Context

(Optional, but helpful for context)

• Device: Laptop
• OS / Distro: Other Linux Distro - Debian 13
• Current NSL Version: v4.2.89

💬 Additional Context

Add any other context, mockups, or screenshots related to your suggestion here.
You can also include:

• Why this feature would improve the Linux/Steam Deck experience
• Whether it should be optional or enabled by default
• If it relates to an existing issue or pull request