Filtere Statusuebersicht nach Diagnosekriterien

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

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

server/backend/internal/httpapi/playerstatus.go

@@ -128,12 +128,27 @@ func handleGetLatestPlayerStatus(store playerStatusStore) http.HandlerFunc {
 func handleListLatestPlayerStatuses(store playerStatusStore) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		records := store.List()
+		wantConnectivity := strings.TrimSpace(r.URL.Query().Get("server_connectivity"))
+		wantStale := strings.TrimSpace(r.URL.Query().Get("stale"))
+		filtered := make([]playerStatusRecord, 0, len(records))
 		for i := range records {
 			records[i].Stale = isStale(records[i], store.Now())
+			if wantConnectivity != "" && records[i].ServerConnectivity != wantConnectivity {
+				continue
+			}
+			if wantStale != "" {
+				if wantStale == "true" && !records[i].Stale {
+					continue
+				}
+				if wantStale == "false" && records[i].Stale {
+					continue
+				}
+			}
+			filtered = append(filtered, records[i])
 		}
 
 		writeJSON(w, http.StatusOK, map[string]any{
-			"screens": records,
+			"screens": filtered,
 		})
 	}
 }

server/backend/internal/httpapi/playerstatus_test.go

@@ -402,3 +402,36 @@ func TestHandleListLatestPlayerStatuses(t *testing.T) {
 		t.Fatalf("response.Screens[0].ScreenID = %q, want %q", got, want)
 	}
 }
+
+func TestHandleListLatestPlayerStatusesFiltersByConnectivityAndStale(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})
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/status?server_connectivity=offline&stale=true", nil)
+	w := httptest.NewRecorder()
+
+	handleListLatestPlayerStatuses(store)(w, req)
+
+	if got, want := w.Code, http.StatusOK; got != want {
+		t.Fatalf("status = %d, want %d", got, want)
+	}
+
+	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 := len(response.Screens), 1; got != want {
+		t.Fatalf("len(response.Screens) = %d, want %d", got, want)
+	}
+
+	if got, want := response.Screens[0].ScreenID, "screen-offline"; got != want {
+		t.Fatalf("response.Screens[0].ScreenID = %q, want %q", got, want)
+	}
+}