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>

cmd/root.go

@@ -15,7 +15,6 @@ import (
 	"github.com/navidrome/navidrome/db"
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
-	"github.com/navidrome/navidrome/plugins"
 	"github.com/navidrome/navidrome/resources"
 	"github.com/navidrome/navidrome/scanner"
 	"github.com/navidrome/navidrome/scheduler"
@@ -193,7 +192,7 @@ func runInitialScan(ctx context.Context) func() error {
 		scanNeeded := conf.Server.Scanner.ScanOnStartup || inProgress || fullScanRequired == "1" || pidHasChanged
 		time.Sleep(2 * time.Second) // Wait 2 seconds before the initial scan
 		if scanNeeded {
-			scanner := CreateScanner(ctx)
+			s := CreateScanner(ctx)
 			switch {
 			case fullScanRequired == "1":
 				log.Warn(ctx, "Full scan required after migration")
@@ -207,7 +206,7 @@ func runInitialScan(ctx context.Context) func() error {
 				log.Info("Executing initial scan")
 			}
 
-			_, err = scanner.ScanAll(ctx, fullScanRequired == "1")
+			_, err = s.ScanAll(ctx, fullScanRequired == "1")
 			if err != nil {
 				log.Error(ctx, "Scan failed", err)
 			} else {
@@ -337,7 +336,7 @@ func startPluginManager(ctx context.Context) func() error {
 		}
 		log.Info(ctx, "Starting plugin manager")
 		// Get the manager instance and scan for plugins
-		manager := plugins.GetManager()
+		manager := GetPluginManager(ctx)
 		manager.ScanPlugins()
 
 		return nil