fix(modem): Use generated AT command definitions for IDE navigation

BREAKING CHANGE: inc headers for AT command definitions are no longer used directly, but pregenerated into *.h(pp)

components/esp_modem/generate/include/esp_modem_api.h

@@ -0,0 +1,30 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "esp_err.h"
+//#include "generate/esp_modem_command_declare.inc"
+#include "esp_modem_c_api_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//  --- ESP-MODEM command module starts here ---
+#include "esp_modem_command_declare_helper.inc"
+
+#define ESP_MODEM_DECLARE_DCE_COMMAND(name, return_type, ...) \
+        esp_err_t esp_modem_ ## name(esp_modem_dce_t *dce ESP_MODEM_COMMAND_PARAMS_AFTER(__VA_ARGS__));
+
+#include "esp_modem_command_declare.inc"
+
+#undef ESP_MODEM_DECLARE_DCE_COMMAND
+//  --- ESP-MODEM command module ends here ---
+
+#ifdef __cplusplus
+}
+#endif