Add scrobbling support (Last.fm + ListenBrainz) and rsp settings reload

- Full Last.fm API implementation with MD5 signing (track.updateNowPlaying, track.scrobble)
- Full ListenBrainz API implementation (/1/submit-listens for playing_now and single)
- ScrobbleState in daemon tracking track, start time, and unix timestamp per play
- Scrobble threshold: ≥30s play AND (≥half duration OR ≥4 min)
- Duration extraction from symphonia codec params into AudioMetadata and Track
- Token validation at daemon startup and on config change
- ListenBrainz token valid (user: Salmonium) command to re-read config from disk (avoids token in shell history)
- Desktop notifications for token validation results
- Empty-credential filtering (empty string = no-op)

1 files changed, 4 insertions, 2 deletions

diff --git a/Cargo.toml b/Cargo.toml
index afcc9cf..270ea7d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rsp"
-version = "0.5.0"
+version = "0.8.0"
 edition = "2024"
 description = "Rust music player daemon with Unix socket IPC"
 license = "GPL-3.0 or later"
@@ -23,7 +23,7 @@ directories = "6.0"
 serde = { version = "1.0.228", features = ["derive"] }
 toml = "1.1.2"
 tokio = { version = "1.52.2", features = ["full"] }
-reqwest = { version = "0.13.3", features = ["json"] }
+reqwest = { version = "0.13.3", features = ["json", "form", "blocking"] }
 symphonia = { version = "0.5.5", features = ["all"] }
 cpal = "0.17.3"
 chrono = "0.4.44"
@@ -34,6 +34,8 @@ ctrlc = "3.5.2"
 rand = "0.10.1"
 notify-rust = "4.17.0"
 terminal_size = "0.4.4"
+md-5 = "0.11.0"
+hex = "0.4.3"
 
 [dev-dependencies]
 tempfile = "3.17"