Reverse proxy authentication support (#1152)

* feat(auth): reverse proxy authentication support - #176

* address PR remarks

* Fix redaction of UI appConfig

Co-authored-by: Deluan <deluan@navidrome.org>

log/log.go

@@ -24,6 +24,11 @@ var redacted = &Hook{
 		"(Secret:\")[\\w]*",
 		"(Spotify.*ID:\")[\\w]*",
 
+		// UI appConfig
+		"(subsonicToken:)[\\w]+(\\s)",
+		"(subsonicSalt:)[\\w]+(\\s)",
+		"(token:)[^\\s]+",
+
 		// Subsonic query params
 		"([^\\w]t=)[\\w]+",
 		"([^\\w]s=)[^&]+",