refactor: organize Rust modules and simplify deployment README

src/http/system.rs

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-only
+use super::State;
+use crate::error::Result;
+use actix_web::HttpResponse;
+
+pub(super) async fn status(state: State) -> Result<HttpResponse> {
+    let active = state.store.active_downloader_id().await?;
+    Ok(HttpResponse::Ok().json(serde_json::json!({
+        "downloader_configured": active.is_some(),
+        "active_downloader_id": active,
+        "active_destination_id": state.store.active_destination_id().await?,
+        "legacy_unassigned_jobs": state.store.legacy_unassigned_count().await?,
+        "version": env!("CARGO_PKG_VERSION")
+    })))
+}
+
+pub(super) async fn run(state: State) -> Result<HttpResponse> {
+    Ok(HttpResponse::Ok().json(state.cycle().await?))
+}
+
+pub(super) async fn health() -> HttpResponse {
+    HttpResponse::Ok()
+        .json(serde_json::json!({"status": "ok", "version": env!("CARGO_PKG_VERSION")}))
+}