feat: add gRPC client with config-based server address and album support

- Add tonic/prost gRPC client connecting to music-agregator service
- Add config.yaml for configurable server host/port
- Add build.rs for proto compilation from music-agregator
- Update Artist/Album models to match proto with MonitorState enum
- Convert album list from GetArtists response
- Fix album click selection with correct layout offsets
- Improve monitor state icons for better visibility

src/config.rs

@@ -0,0 +1,26 @@
+use serde::Deserialize;
+use std::fs;
+use std::path::Path;
+
+#[derive(Debug, Deserialize)]
+pub struct Config {
+    pub server: ServerConfig,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct ServerConfig {
+    pub host: String,
+    pub port: u16,
+}
+
+impl Config {
+    pub fn load<P: AsRef<Path>>(path: P) -> Result<Self, Box<dyn std::error::Error>> {
+        let contents = fs::read_to_string(path)?;
+        let config: Config = serde_yaml::from_str(&contents)?;
+        Ok(config)
+    }
+
+    pub fn grpc_addr(&self) -> String {
+        format!("http://{}:{}", self.server.host, self.server.port)
+    }
+}