refactor ♻️: Updated I2S sample rate from 8 kHz to 4 kHz, reduced DMA buffer count and length, adjusted gain for 16-bit range, increased task stack size and priority, and decreased debug interval

- Updated `AudioLevelTracker.h` to scale the maximum range limit by a factor of 16.
- Updated the I2S sample rate from 8 kHz to 4 kHz, reduced DMA buffer count and length, adjusted gain for 16-bit range, increased task stack size and priority, and decreased debug interval.
- The `initI2S` function has been modified to use a smaller buffer size and adjust the data format to 16-bit, ensuring compatibility with existing code while reducing memory usage.

include/AudioLevelTracker.h

@@ -2,6 +2,7 @@
 
 #include <Arduino.h>
 #include <deque>
+#include "Config.h"
 
 class AudioLevelTracker {
 public:
@@ -19,5 +20,5 @@ private:
     int32_t maxLevel;
 
     static const uint32_t HISTORY_DURATION_MS = 3000;  // 3 seconds history
-    static const int32_t MAX_RANGE_LIMIT = 200000000;  // Maximum allowed range limit
+    static const int32_t MAX_RANGE_LIMIT = Config::DEFAULT_RANGE_LIMIT << 16;  // Scale up 16-bit limit
 };