Add KNX DALI Gateway Module and Message Queue Implementation

- Introduced KnxDaliModule class for handling DALI message queuing, commissioning, and KNX group-object dispatch.
- Implemented Message and MessageQueue classes for managing message operations.
- Removed obsolete OpenKNX IDF component files and CMake configurations.
- Updated submodule reference for KNX.

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

components/knx_dali_gw/include/knx_dali_gw.hpp

@@ -0,0 +1,55 @@
+#pragma once
+
+// =============================================================================
+// knx_dali_gw — KNX-to-DALI Gateway Component (ESP-IDF)
+// =============================================================================
+
+#include "esp_idf_platform.h"
+
+#include "dali_domain.hpp"
+
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <vector>
+
+// Forward declarations.
+class Bau07B0;
+
+namespace gateway {
+namespace knx_dali_gw {
+
+struct KnxDaliGatewayConfig {
+  std::string nvs_namespace{"knx_dali_gw"};
+  uint16_t fallback_individual_address{0xfffe};
+  int dali_channel{0};
+};
+
+class KnxDaliGateway {
+ public:
+  explicit KnxDaliGateway(const KnxDaliGatewayConfig& config);
+  ~KnxDaliGateway();
+
+  KnxDaliGateway(const KnxDaliGateway&) = delete;
+  KnxDaliGateway& operator=(const KnxDaliGateway&) = delete;
+
+  bool init();
+  void loop();
+
+  Bau07B0& knxDevice();
+  const Bau07B0& knxDevice() const;
+
+  void setNetworkInterface(esp_netif_t* netif);
+  bool handleTunnelFrame(const uint8_t* data, size_t len);
+  bool handleBusFrame(const uint8_t* data, size_t len);
+  bool emitGroupValue(uint16_t group_object_number, const uint8_t* data,
+                      size_t len);
+
+ private:
+  struct Impl;
+  std::unique_ptr<Impl> impl_;
+};
+
+}  // namespace knx_dali_gw
+}  // namespace gateway