feat(gateway): Update SDK configuration and add 485 control bridge

- Changed flash size configuration from 16MB to 4MB and updated partition table filename.
- Introduced two gateway channels with UART configurations for communication.
- Added support for gateway cache and startup services including BLE and Wi-Fi.
- Enabled SPI RAM and configured its parameters for better memory management.
- Enhanced the gateway bridge service to handle generated Modbus points more efficiently.
- Refactored the gateway Modbus component to improve point management and added new methods for point description and generation.
- Implemented a new Gateway485ControlBridge for handling 485 control communication with UART.
- Added necessary files for the 485 control bridge including configuration and implementation.

Signed-off-by: Tony <tonylu@tony-cloud.com>

components/gateway_modbus/include/gateway_modbus.hpp

@@ -119,12 +119,14 @@ struct GatewayModbusPoint {
   std::string name;
   bool generated{false};
   GatewayModbusGeneratedKind generated_kind{GatewayModbusGeneratedKind::kNone};
+  const char* generated_suffix{"point"};
+  const char* generated_name{"point"};
   int short_address{-1};
   std::string model_id;
   BridgeOperation operation{BridgeOperation::unknown};
   std::optional<int> bit_index;
-  std::string diagnostic_snapshot;
-  std::string diagnostic_bool;
+  const char* diagnostic_snapshot{""};
+  const char* diagnostic_bool{""};
   int diagnostic_device_type{-1};
 };
 
@@ -165,8 +167,12 @@ class GatewayModbusBridge {
   void rebuildMap();
   std::optional<GatewayModbusPoint> findPoint(GatewayModbusSpace space,
                                               uint16_t address) const;
+  GatewayModbusPointBinding describePoint(const GatewayModbusPoint& point) const;
+  void appendGeneratedPointsForShortAddress(uint8_t short_address,
+                                            std::vector<GatewayModbusPoint>* points) const;
   std::vector<GatewayModbusPointBinding> describePoints() const;
   std::vector<GatewayModbusPointBinding> describeHoldingRegisters() const;
+  const std::vector<GatewayModbusPoint>& points() const;
 
   DaliBridgeResult readModelPoint(const GatewayModbusPoint& point) const;
   DaliBridgeResult writeRegisterPoint(const GatewayModbusPoint& point, uint16_t value) const;