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.

include/bridge_model.hpp

@@ -0,0 +1,117 @@
+#pragma once
+
+#include "model_value.hpp"
+
+#include <optional>
+#include <string>
+
+enum class BridgeProtocolKind {
+  unknown = 0,
+  mqtt = 1,
+  modbus = 2,
+  bacnet = 3,
+};
+
+enum class BridgeObjectType {
+  unknown = 0,
+  holdingRegister = 1,
+  inputRegister = 2,
+  coil = 3,
+  discreteInput = 4,
+  analogValue = 5,
+  analogOutput = 6,
+  binaryValue = 7,
+  binaryOutput = 8,
+  multiStateValue = 9,
+};
+
+enum class BridgeOperation {
+  unknown = 0,
+  send = 1,
+  sendExt = 2,
+  query = 3,
+  setBrightness = 4,
+  setBrightnessPercent = 5,
+  on = 6,
+  off = 7,
+  recallMaxLevel = 8,
+  recallMinLevel = 9,
+  setColorTemperature = 10,
+  getBrightness = 11,
+  getStatus = 12,
+  getColorTemperature = 13,
+  getColorStatus = 14,
+  getEmergencyLevel = 15,
+  getEmergencyStatus = 16,
+  getEmergencyFailureStatus = 17,
+  startEmergencyFunctionTest = 18,
+  stopEmergencyTest = 19,
+};
+
+enum class BridgeValueEncoding {
+  none = 0,
+  integer = 1,
+  percentage = 2,
+  kelvin = 3,
+};
+
+struct BridgeValueTransform {
+  double scale = 1.0;
+  double offset = 0.0;
+  std::optional<int> clampMin;
+  std::optional<int> clampMax;
+
+  static BridgeValueTransform fromJson(const DaliValue::Object* json);
+  DaliValue::Object toJson() const;
+  int apply(double raw) const;
+};
+
+struct BridgeExternalPoint {
+  std::string network;
+  std::string device;
+  BridgeObjectType objectType = BridgeObjectType::unknown;
+  std::optional<int> objectInstance;
+  std::optional<int> registerAddress;
+  std::optional<int> bitIndex;
+  std::string property;
+
+  static BridgeExternalPoint fromJson(const DaliValue::Object* json);
+  DaliValue::Object toJson() const;
+};
+
+struct BridgeDaliTarget {
+  std::optional<int> shortAddress;
+  std::optional<int> rawAddress;
+  std::optional<int> rawCommand;
+
+  static BridgeDaliTarget fromJson(const DaliValue::Object* json);
+  DaliValue::Object toJson() const;
+};
+
+struct BridgeModel {
+  std::string id;
+  std::string name;
+  BridgeProtocolKind protocol = BridgeProtocolKind::unknown;
+  BridgeExternalPoint external;
+  BridgeDaliTarget dali;
+  BridgeOperation operation = BridgeOperation::unknown;
+  BridgeValueEncoding valueEncoding = BridgeValueEncoding::integer;
+  BridgeValueTransform valueTransform;
+  DaliValue::Object metadata;
+
+  static BridgeModel fromJson(const DaliValue::Object& json);
+  DaliValue::Object toJson() const;
+  std::string displayName() const;
+};
+
+const char* bridgeProtocolKindToString(BridgeProtocolKind kind);
+BridgeProtocolKind bridgeProtocolKindFromString(const std::string& value);
+
+const char* bridgeObjectTypeToString(BridgeObjectType type);
+BridgeObjectType bridgeObjectTypeFromString(const std::string& value);
+
+const char* bridgeOperationToString(BridgeOperation operation);
+BridgeOperation bridgeOperationFromString(const std::string& value);
+
+const char* bridgeValueEncodingToString(BridgeValueEncoding encoding);
+BridgeValueEncoding bridgeValueEncodingFromString(const std::string& value);