Priorisiere Statusuebersicht fuer Diagnosefaelle

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

docs/PLAYER-STATUS-HTTP.md

@@ -75,6 +75,7 @@ Zusätzlich zur Write-Route gibt es in dieser Stufe:
 - `GET /api/v1/screens/{screenId}/status`
 
 `GET /api/v1/screens/status` liefert eine kleine Uebersicht aller bisher berichtenden Screens mit ihrem jeweils letzten bekannten Datensatz.
+Die Rueckgabe wird aktuell fuer Diagnosezwecke priorisiert sortiert: zuerst `offline`, dann `degraded`, dann `online`, innerhalb derselben Gruppe nach `screen_id`.
 
 `GET /api/v1/screens/{screenId}/status` liefert den zuletzt akzeptierten Status fuer einen einzelnen Screen zurueck.
 Wenn fuer den Screen noch kein Status vorliegt, liefert das Backend `404` mit dem gemeinsamen Fehlerumschlag.

server/backend/internal/httpapi/playerstatus.go

@@ -2,6 +2,7 @@ package httpapi
 
 import (
 	"net/http"
+	"sort"
 	"strings"
 	"time"
 )
@@ -149,6 +150,16 @@ func handleListLatestPlayerStatuses(store playerStatusStore) http.HandlerFunc {
 			filtered = append(filtered, records[i])
 		}
 
+		sort.Slice(filtered, func(i, j int) bool {
+			leftPriority := derivedStatePriority(filtered[i].DerivedState)
+			rightPriority := derivedStatePriority(filtered[j].DerivedState)
+			if leftPriority != rightPriority {
+				return leftPriority < rightPriority
+			}
+
+			return filtered[i].ScreenID < filtered[j].ScreenID
+		})
+
 		writeJSON(w, http.StatusOK, map[string]any{
 			"screens": filtered,
 		})
@@ -197,3 +208,14 @@ func deriveState(record playerStatusRecord) string {
 
 	return "online"
 }
+
+func derivedStatePriority(state string) int {
+	switch state {
+	case "offline":
+		return 0
+	case "degraded":
+		return 1
+	default:
+		return 2
+	}
+}

server/backend/internal/httpapi/playerstatus_test.go

@@ -439,6 +439,44 @@ func TestHandleListLatestPlayerStatuses(t *testing.T) {
 	if got, want := response.Screens[0].ScreenID, "screen-a"; got != want {
 		t.Fatalf("response.Screens[0].ScreenID = %q, want %q", got, want)
 	}
+
+	if got, want := response.Screens[1].ScreenID, "screen-b"; got != want {
+		t.Fatalf("response.Screens[1].ScreenID = %q, want %q", got, want)
+	}
+}
+
+func TestHandleListLatestPlayerStatusesOrdersProblematicScreensFirst(t *testing.T) {
+	store := newInMemoryPlayerStatusStore()
+	store.now = func() time.Time {
+		return time.Date(2026, 3, 22, 16, 10, 0, 0, time.UTC)
+	}
+	store.Save(playerStatusRecord{ScreenID: "screen-online", Timestamp: "2026-03-22T16:09:30Z", Status: "running", ServerConnectivity: "online", ReceivedAt: "2026-03-22T16:09:30Z", HeartbeatEverySeconds: 30})
+	store.Save(playerStatusRecord{ScreenID: "screen-offline", Timestamp: "2026-03-22T16:00:00Z", Status: "running", ServerConnectivity: "offline", ReceivedAt: "2026-03-22T16:00:00Z", HeartbeatEverySeconds: 30})
+	store.Save(playerStatusRecord{ScreenID: "screen-degraded", Timestamp: "2026-03-22T16:09:00Z", Status: "running", ServerConnectivity: "degraded", ReceivedAt: "2026-03-22T16:09:00Z", HeartbeatEverySeconds: 30})
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/status", nil)
+	w := httptest.NewRecorder()
+
+	handleListLatestPlayerStatuses(store)(w, req)
+
+	var response struct {
+		Screens []playerStatusRecord `json:"screens"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+
+	if got, want := response.Screens[0].ScreenID, "screen-offline"; got != want {
+		t.Fatalf("response.Screens[0].ScreenID = %q, want %q", got, want)
+	}
+
+	if got, want := response.Screens[1].ScreenID, "screen-degraded"; got != want {
+		t.Fatalf("response.Screens[1].ScreenID = %q, want %q", got, want)
+	}
+
+	if got, want := response.Screens[2].ScreenID, "screen-online"; got != want {
+		t.Fatalf("response.Screens[2].ScreenID = %q, want %q", got, want)
+	}
 }
 
 func TestHandleListLatestPlayerStatusesFiltersByConnectivityAndStale(t *testing.T) {