feat: Added Navidrome server side "song radio" queue support

[FormalSnake]

Added song radio support for navidrome servers that support it. For example, Audiomuse classifies songs with a ML and adds queue support, other clients support this and Kopuz did not.
AI has been used for some parts, it has been tested by hand

Sanity Checking

• I have read and followed the contribution guidelines.
• My commits follow Kopuz's scoped commit convention and history hygiene
  rules.
• I have disclosed any AI assistance as required by the AI policy in the
  contribution guidelines, or this pull request did not use AI assistance.
• I have tested and self-reviewed my changes.

Style and Consistency

• My changes are consistent with the existing crate boundaries and Dioxus
  style.
• I ran cargo fmt --all --check or cargo fmt --all as appropriate.
• I ran cargo clippy --workspace --all-targets -- -D warnings, or
  explained why it could not be run.
• I kept generated assets, translations, and packaging files in sync when
  this change depends on them.

Testing

• I ran the smallest relevant verifier for this change.
• I documented any platform or verifier that I could not run.

Tested on platform(s):

• x86_64-linux
• aarch64-linux
• x86_64-darwin
• aarch64-darwin
• Windows
• Android
• iOS

[coderabbitai]

📝 Walkthrough

Walkthrough

Subsonic now supports similar-song retrieval for radio playback. A shared converter maps songs to tracks with cover and album metadata. Playlist conversion reuses the converter.

Changes

Subsonic radio support

Layer / File(s)	Summary
Similar-song API contract and client method crates/server/src/subsonic.rs	Adds response models for getSimilarSongs2 and a client method that returns similar songs or an empty list when data is absent.
Track conversion and radio initialization crates/server/src/source/subsonic.rs	Adds shared song-to-track conversion, reuses it for playlist entries, enables radio, and converts up to 50 similar songs into tracks.

Sequence Diagram(s)

sequenceDiagram
  participant SubsonicSource
  participant SubsonicClient
  participant SubsonicServer
  participant TrackConverter
  SubsonicSource->>SubsonicClient: request up to 50 similar songs
  SubsonicClient->>SubsonicServer: call getSimilarSongs2.view
  SubsonicServer-->>SubsonicClient: return similar-song response
  SubsonicClient-->>SubsonicSource: return song vector
  SubsonicSource->>TrackConverter: convert songs to tracks
  TrackConverter-->>SubsonicSource: return tracks

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Suggested reviewers: temidaradev, notashelf, umceko

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: server-side song radio queue support for Navidrome.
Description check	✅ Passed	The description explains the Navidrome song radio support, its purpose, testing, and verification scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/server/src/source/subsonic.rs`:
- Line 230: Update the Subsonic source setup surrounding the radio capability
assignment so radio is enabled only when the server is confirmed to support
getSimilarSongs2; otherwise set radio to false or leave it disabled. Ensure
start_radio is not advertised for servers lacking similar-song support.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d60ec925-449b-47bd-b190-09fbb7da2118

📥 Commits

Reviewing files that changed from the base of the PR and between 0f8b355 and 8ed87eb.

📒 Files selected for processing (2)

• crates/server/src/source/subsonic.rs
• crates/server/src/subsonic.rs

[coderabbitai]

🎯 Functional Correctness | 🟠 Major | 🏗️ Heavy lift

Do not advertise radio when the server cannot provide similar songs.

Line 230 enables radio for every Subsonic source. get_similar_songs documents that the endpoint needs a server-side plugin. Servers without that plugin will expose the radio action and then fail at start_radio.

Detect support during source setup, or keep radio disabled until configuration confirms that the server supports getSimilarSongs2.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@crates/server/src/source/subsonic.rs` at line 230, Update the Subsonic source
setup surrounding the radio capability assignment so radio is enabled only when
the server is confirmed to support getSimilarSongs2; otherwise set radio to
false or leave it disabled. Ensure start_radio is not advertised for servers
lacking similar-song support.