fix(poi): Fehler beim Hinzufügen von POIs behoben (Modal blieb offen)

- Falsche URL im addPoiService korrigiert (/addLocation → /addPoi)
- Redux-Status wird nach erfolgreichem Hinzufügen zurückgesetzt (resetAddPoiStatus)
- Modal schließt jetzt zuverlässig nach dem Dispatch
- Ladeanzeige "Wird hinzugefügt..." verschwindet korrekt
- Version auf 1.1.176 erhöht

redux/slices/database/pois/poiMarkersSlice.js

@@ -0,0 +1,44 @@
+// /redux/slices/database/pois/poiMarkersSlice.js
+import { createSlice } from "@reduxjs/toolkit";
+import { fetchPoiMarkersThunk } from "../../../thunks/database/pois/fetchPoiMarkersThunk";
+
+const initialState = {
+  data: [],
+  status: "idle",
+  error: null,
+};
+
+const poiMarkersSlice = createSlice({
+  name: "poiMarkers",
+  initialState,
+  reducers: {
+    setPoiMarkers: (state, action) => {
+      state.data = action.payload;
+    },
+    clearPoiMarkers: (state) => {
+      state.data = [];
+    },
+  },
+  extraReducers: (builder) => {
+    builder
+      .addCase(fetchPoiMarkersThunk.pending, (state) => {
+        state.status = "loading";
+      })
+      .addCase(fetchPoiMarkersThunk.fulfilled, (state, action) => {
+        state.status = "succeeded";
+        state.data = action.payload;
+      })
+      .addCase(fetchPoiMarkersThunk.rejected, (state, action) => {
+        state.status = "failed";
+        state.error = action.error.message;
+      });
+  },
+});
+
+export const { setPoiMarkers, clearPoiMarkers } = poiMarkersSlice.actions;
+
+export const selectPoiMarkers = (state) => state.poiMarkers.data;
+export const selectPoiMarkersStatus = (state) => state.poiMarkers.status;
+export const selectPoiMarkersError = (state) => state.poiMarkers.error;
+
+export default poiMarkersSlice.reducer;