fix(deps): upgrade pandas to 3.1 and fix EOS deprecations (#1469)

* build(deps): bump pandas from 3.0.6 to 3.1.0

* fix(prediction): avoid pandas 3.1 deprecation warnings

tests/test_eosdashprediction.py

@@ -0,0 +1,57 @@
+from unittest.mock import Mock
+
+import pandas as pd
+import pytest
+
+from akkudoktoreos.server.dash import prediction
+
+
+@pytest.mark.parametrize("dark", [False, True])
+def test_prediction_preserves_series_and_local_times_without_pandas_deprecations(monkeypatch, dark):
+    # Across the autumn DST transition, two distinct instants share a local wall time.
+    timestamps = ["2026-10-25T00:30:00Z", "2026-10-25T01:30:00Z", "2026-10-25T02:30:00Z"]
+    values = [1.0, 2.0, 3.0]
+    config = {"test": "configuration"}
+    keys = []
+
+    def get(url, **kwargs):
+        if url.endswith("/v1/config"):
+            return Mock(json=lambda: config)
+        assert url.endswith("/v1/prediction/series")
+        keys.append(kwargs["params"]["key"])
+        return Mock(json=lambda: {
+            "data": dict(zip(timestamps, values)),
+            "dtype": "float64",
+            "tz": "Europe/Berlin",
+        })
+
+    monkeypatch.setattr(prediction.requests, "get", get)
+    plots = []
+    for name in (
+        "PVForecast",
+        "ElectricityPriceForecast",
+        "WeatherTempAirHumidityForecast",
+        "WeatherIrradianceForecast",
+        "LoadForecast",
+    ):
+        plot = Mock(return_value=name)
+        monkeypatch.setattr(prediction, name, plot)
+        plots.append(plot)
+    grid = Mock(return_value="prediction grid")
+    monkeypatch.setattr(prediction, "Grid", grid)
+
+    assert prediction.Prediction("localhost", 8503, {"dark": str(dark).lower()}) == "prediction grid"
+
+    expected = pd.DataFrame({
+        "date_time": pd.to_datetime(timestamps).tz_convert("Europe/Berlin").tz_localize(None),
+        **{key: values for key in keys},
+    })
+    assert len(keys) == 10
+    for plot in plots:
+        plot.assert_called_once()
+        actual, actual_config, timezone, actual_dark = plot.call_args.args
+        pd.testing.assert_frame_equal(actual, expected)
+        assert actual_config == config
+        assert str(timezone) == "Europe/Berlin"
+        assert actual_dark is dark
+    grid.assert_called_once_with(*(plot.return_value for plot in plots), cols_max=2)