feat: standardize device type for Sound Level Meters (SLM)

- Updated all instances of device_type from "sound_level_meter" to "slm" across the codebase.
- Enhanced documentation to reflect the new device type standardization.
- Added migration script to convert legacy device types in the database.
- Updated relevant API endpoints, models, and frontend templates to use the new device type.
- Ensured backward compatibility by deprecating the old device type without data loss.

backend/services/device_controller.py

@@ -31,7 +31,7 @@ class DeviceController:
 
     Usage:
         controller = DeviceController()
-        await controller.start_recording("nl43-001", "sound_level_meter", config={})
+        await controller.start_recording("nl43-001", "slm", config={})
         await controller.stop_recording("seismo-042", "seismograph")
     """
 
@@ -53,7 +53,7 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
             config: Device-specific recording configuration
 
         Returns:
@@ -63,7 +63,7 @@ class DeviceController:
             UnsupportedDeviceTypeError: Device type not supported
             DeviceControllerError: Operation failed
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.start_recording(unit_id, config)
             except SLMMClientError as e:
@@ -81,7 +81,7 @@ class DeviceController:
         else:
             raise UnsupportedDeviceTypeError(
                 f"Device type '{device_type}' is not supported. "
-                f"Supported types: sound_level_meter, seismograph"
+                f"Supported types: slm, seismograph"
             )
 
     async def stop_recording(
@@ -94,12 +94,12 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
 
         Returns:
             Response dict from device module
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.stop_recording(unit_id)
             except SLMMClientError as e:
@@ -126,12 +126,12 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
 
         Returns:
             Response dict from device module
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.pause_recording(unit_id)
             except SLMMClientError as e:
@@ -157,12 +157,12 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
 
         Returns:
             Response dict from device module
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.resume_recording(unit_id)
             except SLMMClientError as e:
@@ -192,12 +192,12 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
 
         Returns:
             Status dict from device module
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.get_unit_status(unit_id)
             except SLMMClientError as e:
@@ -224,12 +224,12 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
 
         Returns:
             Live data dict from device module
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.get_live_data(unit_id)
             except SLMMClientError as e:
@@ -261,14 +261,14 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
             destination_path: Local path to save files
             files: List of filenames, or None for all
 
         Returns:
             Download result with file list
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.download_files(
                     unit_id,
@@ -304,13 +304,13 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
             config: Configuration parameters
 
         Returns:
             Updated config from device module
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 return await self.slmm_client.update_unit_config(
                     unit_id,
@@ -347,12 +347,12 @@ class DeviceController:
 
         Args:
             unit_id: Unit identifier
-            device_type: "sound_level_meter" | "seismograph"
+            device_type: "slm" | "seismograph"
 
         Returns:
             True if device is reachable, False otherwise
         """
-        if device_type == "sound_level_meter":
+        if device_type == "slm":
             try:
                 status = await self.slmm_client.get_unit_status(unit_id)
                 return status.get("last_seen") is not None