Implement DALI Bridge Engine and Model Management

- Added `bridge.cpp` to handle DALI bridge operations including model management, command execution, and response formatting.
- Introduced `bridge_model.cpp` for defining bridge models, value transformations, and JSON serialization/deserialization.
- Created `bridge_provisioning.cpp` for managing bridge configuration storage and retrieval using NVS on ESP platform.
- Enhanced `gateway_cloud.cpp` to integrate DALI bridge requests and responses with cloud communication.
- Introduced `modbus_bridge.cpp` to handle Modbus-specific operations and register management.
- Implemented utility functions for converting between DaliValue and cJSON formats.
- Added error handling and metadata management in bridge responses.

scripts/export_esp_idf.sh

@@ -0,0 +1,8 @@
+ESP_IDF_EXPORT_PATH="${HOME}/esp/v5.5.2/esp-idf/export.sh"
+
+if [ ! -f "$ESP_IDF_EXPORT_PATH" ]; then
+  echo "ESP-IDF export script not found at $ESP_IDF_EXPORT_PATH" >&2
+  return 1 2>/dev/null || exit 1
+fi
+
+. "$ESP_IDF_EXPORT_PATH"