refactor(steami_config): rename accelerometer calibration key to reduce size

Author: Charly-sketch

lib/steami_config/README.md

@@ -150,7 +150,7 @@ config.apply_accelerometer_calibration(imu)
 Data is stored as compact JSON to fit within 1 KB:
 
 ```json
-{"rev":3,"name":"STeaMi-01","tc":{"hts":{"g":1.0,"o":-0.5}},"cm":{"hx":12.3,"hy":-5.1,"hz":0.8,"sx":1.01,"sy":0.98,"sz":1.0},"cal_accel":{"ox":0.01,"oy":-0.02,"oz":0.03}}
+{"rev":3,"name":"STeaMi-01","tc":{"hts":{"g":1.0,"o":-0.5}},"cm":{"hx":12.3,"hy":-5.1,"hz":0.8,"sx":1.01,"sy":0.98,"sz":1.0},"ca":{"ox":0.01,"oy":-0.02,"oz":0.03}}
 ```
 
 | Key | Content |
@@ -163,8 +163,8 @@ Data is stored as compact JSON to fit within 1 KB:
 | `cm` | Magnetometer calibration dict |
 | `cm.hx/hy/hz` | Hard-iron offsets (X, Y, Z) |
 | `cm.sx/sy/sz` | Soft-iron scale factors (X, Y, Z) |
-| `cal_accel` | Accelerometer calibration dict |
-| `cal_accel.ox/oy/oz` | Bias offsets in g (X, Y, Z) |
+| `ca` | Accelerometer calibration dict |
+| `ca.ox/oy/oz` | Bias offsets in g (X, Y, Z) |
 
 Sensor short keys: `hts` (HTS221), `mag` (LIS2MDL), `ism` (ISM330DL),
 `hid` (WSEN-HIDS), `pad` (WSEN-PADS).

lib/steami_config/steami_config/device.py

@@ -217,7 +217,7 @@ def set_accelerometer_calibration(self, ox=0.0, oy=0.0, oz=0.0):
             oy: Y-axis offset
             oz: Z-axis offset
         """
-        self._data["cal_accel"] = {
+        self._data["ca"] = {
             "ox": float(ox),
             "oy": float(oy),
             "oz": float(oz),
@@ -229,7 +229,7 @@ def get_accelerometer_calibration(self):
         Returns:
             dict with ox, oy, oz or None
         """
-        cal = self._data.get("cal_accel")
+        cal = self._data.get("ca")
         if cal is None:
             return None