Reduce default candlelight flicker speed for more realistic candle effect

Scale speed by 0.35 so speed=1 gives ~1.3 Hz dominant flicker instead of 3.7 Hz.

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

server/src/wled_controller/core/processing/candlelight_stream.py

@@ -189,6 +189,8 @@ class CandlelightColorStripStream(ColorStripStream):
         - Per-LED noise adds individual variation
         - Final brightness modulates the base warm color
         """
+        # Scale speed so that speed=1 gives a gentle ~1.3 Hz dominant flicker
+        speed = speed * 0.35
         intensity = self._intensity
         num_candles = self._num_candles
         base_r, base_g, base_b = self._color[0], self._color[1], self._color[2]