feat(plugins): allow Plugins to call the Subsonic API (#4260)

* chore: .gitignore any navidrome binary

Signed-off-by: Deluan <deluan@navidrome.org>

* feat: implement internal authentication handling in middleware

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(manager): add SubsonicRouter to Manager for API routing

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(plugins): add SubsonicAPI Host service for plugins and an example plugin

Signed-off-by: Deluan <deluan@navidrome.org>

* fix lint

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(plugins): refactor path handling in SubsonicAPI to extract endpoint correctly

Signed-off-by: Deluan <deluan@navidrome.org>

* docs(plugins): add SubsonicAPI service documentation to README

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(plugins): implement permission checks for SubsonicAPI service

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(plugins): enhance SubsonicAPI service initialization with atomic router handling

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(plugins): better encapsulated dependency injection

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(plugins): rename parameter in WithInternalAuth for clarity

Signed-off-by: Deluan <deluan@navidrome.org>

* docs(plugins): update SubsonicAPI permissions section in README for clarity and detail

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(plugins): enhance SubsonicAPI permissions output with allowed usernames and admin flag

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(plugins): add schema reference to example plugins

Signed-off-by: Deluan <deluan@navidrome.org>

* remove import alias

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>

plugins/examples/wikimedia/manifest.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "https://raw.githubusercontent.com/navidrome/navidrome/refs/heads/master/plugins/schema/manifest.schema.json",
   "name": "wikimedia",
   "author": "Navidrome",
   "version": "1.0.0",