log: add log query API endpoints and display logs on web interface

main/log_handler.h

@@ -0,0 +1,42 @@
+#ifndef LOG_HANDLER_H
+#define LOG_HANDLER_H
+
+#include <stddef.h>
+#include "esp_err.h"
+
+/**
+ * @brief Initialize log handler
+ *
+ * @return esp_err_t ESP_OK on success
+ */
+esp_err_t log_handler_init(void);
+
+/**
+ * @brief Deinitialize log handler
+ *
+ * @return esp_err_t ESP_OK on success
+ */
+esp_err_t log_handler_deinit(void);
+
+/**
+ * @brief Get log buffer content
+ *
+ * @param buf Buffer to copy logs into
+ * @param buf_len Length of buffer
+ * @return size_t Number of bytes copied
+ */
+size_t log_get_buffer(char *buf, size_t buf_len);
+
+/**
+ * @brief Clear log buffer
+ */
+void log_clear_buffer(void);
+
+/**
+ * @brief Get current log buffer size
+ *
+ * @return size_t Number of bytes in buffer
+ */
+size_t log_get_size(void);
+
+#endif // LOG_HANDLER_H