feat: add rsync as managed resource — registered in DB + pipeline health check

src/api/server.rs

@@ -480,6 +480,8 @@ struct PipelineStatus {
     gdino_api: ServiceStatus,
     /// LLM via llama.cpp (port 8082)
     llm: ServiceStatus,
+    /// rsync file sync tool
+    rsync: ServiceStatus,
 }
 
 #[derive(Debug, Serialize)]
@@ -589,6 +591,7 @@ async fn health_detailed(State(state): State<AppState>) -> Json<DetailedHealthRe
             embedding_server: check_http("http://127.0.0.1:11436/health").await,
             gdino_api: check_http("http://127.0.0.1:8080/health").await,
             llm: check_http("http://127.0.0.1:8082/health").await,
+            rsync: check_binary("rsync").await,
         },
     })
 }
@@ -723,6 +726,22 @@ async fn check_mongodb(cache: &MongoCache) -> ServiceStatus {
     }
 }
 
+async fn check_binary(name: &str) -> ServiceStatus {
+    let start = Instant::now();
+    match std::process::Command::new("which").arg(name).output() {
+        Ok(output) if output.status.success() => ServiceStatus {
+            status: "ok".to_string(),
+            latency_ms: Some(start.elapsed().as_millis() as u64),
+            error: None,
+        },
+        _ => ServiceStatus {
+            status: "error".to_string(),
+            latency_ms: Some(start.elapsed().as_millis() as u64),
+            error: Some(format!("{} not found in PATH", name)),
+        },
+    }
+}
+
 async fn check_http(url: &str) -> ServiceStatus {
     let start = Instant::now();
     match reqwest::get(url).await {