feat: rework login authentication and add API token support

[Nonary]

Description

Adds token-based authentication to Sunshine’s API and admin UI.
Adds token based sessions as an alternative to basic authentication.
Admins can now create, view, and revoke login-free API tokens that grant only the routes they choose.
The existing Basic-Auth flow is untouched, this adds on top of the existing code; therefore there is no breaking changes.

Why this is secure

Measure	What it means
Hash-only storage	Raw token is shown once, then discarded; only its SHA-256 hash is stored, so a leaked state file reveals nothing usable.
Least-privilege scopes	Each token carries an allow-list of API routes + verbs; any request outside that list is rejected.
One-click revocation	Tokens can be invalidated instantly from the new API Tokens page or via the API.
Non-breaking	Token logic is additive; Basic-Auth requests are processed exactly as before.

Benefits

• Safe automation & integrations – third-party scripts and apps can call the Sunshine API without embedding the admin’s full credentials.
• Minimal blast-radius – each token can be limited to just the endpoints it needs (e.g., /api/apps GET only), reducing risk, where as using basic auth would give full access to everything in Sunshine.
• ** Password manager support ** - Browsers can now safely autofill the login.

Screenshot

Issues Fixed or Closed

None – this is a new capability.

Type of Change

• Bug fix
• New feature
• Breaking change
• Dependency update
• Documentation update
• Repository update

Checklist

• Code follows project style guidelines
• Self-review completed
• Security-critical sections are commented
• Docs and inline docstrings updated

[Nonary]

There appears to be a weird bug in current master branch where there is like a ghost session showing in Moonlight. Thought this may have caused it but it does not.

[Nonary]

There appears to be a weird bug in current master branch where there is like a ghost session showing in Moonlight. Thought this may have caused it but it does not.

Nevermind, only happens when you add a blank app to Sunshine... still a weird bug though

[Nonary]

I removed the frontend unit tests, did another sweep through in cleanup some dead code and comments. I've run through a lot of manual testing and automated testing, so I believe it is ready.

[Nonary]

I was going to re-submit this one with it being stripped down to just the login portion to reduce PR size, since it technically was not asked for specifically in the roadmap. Putting back in draft for now, right now my top priority is WGC capture so not sure when I will come back to this one.

[Nonary]

After reviewing this again nothing needs to be split but there is one more feature I need to add. The frontend should redirect to login screen when an auth error is encountered, so will add that in over the weekend.

[Nonary]

Added better session timeouts, cleaned up the dead code. Login redirects are now working properly, added a new config option for users to define the session ttl for login sessions. Improved UX of the API token page, it's looks much better compared to the original version.

I think that covers everything this needed

[sonarqubecloud]

Quality Gate failed

Failed conditions
16 New issues
1 Security Hotspot
5.0% Duplication on New Code (required ≤ 2%)
C Reliability Rating on New Code (required ≥ A)
15 New Code Smells (required ≤ 0)
1 New Bugs (required ≤ 0)
14 Duplicated Blocks on New Code (required ≤ 0)

See analysis details on SonarQube Cloud

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