refactor(api): embed runtime in unit list/get/detail responses

Remove the standalone GET /api/unit/runtimes endpoint in favour of
embedding runtime directly in existing responses:
- GET /api/unit          → each item now includes `runtime` field
- GET /api/unit/:id      → returns UnitWithRuntime
- GET /api/unit/:id/detail → UnitDetail now includes `runtime`

runtime is null when the engine has not yet initialised the unit.
Frontend loadUnits() reads the embedded runtime field to populate
state.runtimes — one request instead of two.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/handler/control.rs

@@ -26,6 +26,13 @@ pub struct GetUnitListQuery {
     pub pagination: PaginationParams,
 }
 
+#[derive(serde::Serialize)]
+pub struct UnitWithRuntime {
+    #[serde(flatten)]
+    pub unit: crate::model::ControlUnit,
+    pub runtime: Option<crate::control::runtime::UnitRuntime>,
+}
+
 pub async fn get_unit_list(
     State(state): State<AppState>,
     Query(query): Query<GetUnitListQuery>,
@@ -41,6 +48,15 @@ pub async fn get_unit_list(
     )
     .await?;
 
+    let all_runtimes = state.control_runtime.get_all().await;
+    let data = data
+        .into_iter()
+        .map(|unit| {
+            let runtime = all_runtimes.get(&unit.id).cloned();
+            UnitWithRuntime { unit, runtime }
+        })
+        .collect::<Vec<_>>();
+
     Ok(Json(PaginatedResponse::new(
         data,
         total,
@@ -118,10 +134,11 @@ pub async fn get_unit(
     State(state): State<AppState>,
     Path(unit_id): Path<Uuid>,
 ) -> Result<impl IntoResponse, ApiErr> {
-    match crate::service::get_unit_by_id(&state.pool, unit_id).await? {
-        Some(unit) => Ok(Json(unit)),
-        None => Err(ApiErr::NotFound("Unit not found".to_string(), None)),
-    }
+    let unit = crate::service::get_unit_by_id(&state.pool, unit_id)
+        .await?
+        .ok_or_else(|| ApiErr::NotFound("Unit not found".to_string(), None))?;
+    let runtime = state.control_runtime.get(unit_id).await;
+    Ok(Json(UnitWithRuntime { unit, runtime }))
 }
 
 #[derive(serde::Serialize)]
@@ -142,6 +159,7 @@ pub struct EquipmentDetail {
 pub struct UnitDetail {
     #[serde(flatten)]
     pub unit: crate::model::ControlUnit,
+    pub runtime: Option<crate::control::runtime::UnitRuntime>,
     pub equipments: Vec<EquipmentDetail>,
 }
 
@@ -153,6 +171,8 @@ pub async fn get_unit_detail(
         .await?
         .ok_or_else(|| ApiErr::NotFound("Unit not found".to_string(), None))?;
 
+    let runtime = state.control_runtime.get(unit_id).await;
+
     let equipments = crate::service::get_equipment_by_unit_id(&state.pool, unit_id).await?;
     let equipment_ids: Vec<Uuid> = equipments.iter().map(|e| e.id).collect();
     let all_points = crate::service::get_points_by_equipment_ids(&state.pool, &equipment_ids).await?;
@@ -177,7 +197,7 @@ pub async fn get_unit_detail(
         })
         .collect();
 
-    Ok(Json(UnitDetail { unit, equipments }))
+    Ok(Json(UnitDetail { unit, runtime, equipments }))
 }
 
 #[derive(Debug, Deserialize, Validate)]
@@ -510,10 +530,3 @@ pub async fn get_unit_runtime(
     Ok(Json(runtime))
 }
 
-/// Returns all known runtimes as { unit_id: UnitRuntime }.
-/// Used by the frontend on page load to populate initial state.
-pub async fn get_all_unit_runtimes(
-    State(state): State<AppState>,
-) -> impl IntoResponse {
-    Json(state.control_runtime.get_all().await)
-}

src/main.rs

@@ -209,10 +209,6 @@ fn build_router(state: AppState) -> Router {
             "/api/unit",
             get(handler::control::get_unit_list).post(handler::control::create_unit),
         )
-        .route(
-            "/api/unit/runtimes",
-            get(handler::control::get_all_unit_runtimes),
-        )
         .route(
             "/api/unit/{unit_id}",
             get(handler::control::get_unit)

web/js/units.js

@@ -180,10 +180,7 @@ export function renderUnits() {
 }
 
 export async function loadUnits() {
-  const [response, runtimes] = await Promise.all([
-    apiFetch("/api/unit?page=1&page_size=-1"),
-    apiFetch("/api/unit/runtimes").catch(() => ({})),
-  ]);
+  const response = await apiFetch("/api/unit?page=1&page_size=-1");
   state.units = response.data || [];
   state.unitMap = new Map(state.units.map((unit) => [unit.id, unit]));
 
@@ -191,9 +188,9 @@ export async function loadUnits() {
     state.selectedUnitId = null;
   }
 
-  for (const [unitId, runtime] of Object.entries(runtimes)) {
-    state.runtimes.set(unitId, runtime);
-  }
+  state.units.forEach((unit) => {
+    if (unit.runtime) state.runtimes.set(unit.id, unit.runtime);
+  });
 
   renderUnits();
   renderUnitOptions(dom.equipmentUnitId?.value || "", dom.equipmentUnitId);