feat: add logging system and debug audio routing

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

logging.h

@@ -0,0 +1,36 @@
+#ifndef LOGGING_H
+#define LOGGING_H
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <time.h>
+
+// Log levels
+typedef enum {
+    LOG_LEVEL_ERROR,
+    LOG_LEVEL_WARN,
+    LOG_LEVEL_INFO,
+    LOG_LEVEL_DEBUG,
+    LOG_LEVEL_TRACE
+} LogLevel;
+
+// Initialize logging system
+void log_init(const char *filename, LogLevel level);
+
+// Cleanup logging system
+void log_cleanup(void);
+
+// Set minimum log level
+void log_set_level(LogLevel level);
+
+// Log a message
+void log_message(LogLevel level, const char *file, int line, const char *func, const char *format, ...);
+
+// Convenience macros
+#define LOG_ERROR(...)   log_message(LOG_LEVEL_ERROR, __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define LOG_WARN(...)    log_message(LOG_LEVEL_WARN, __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define LOG_INFO(...)    log_message(LOG_LEVEL_INFO, __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define LOG_DEBUG(...)   log_message(LOG_LEVEL_DEBUG, __FILE__, __LINE__, __func__, __VA_ARGS__)
+#define LOG_TRACE(...)   log_message(LOG_LEVEL_TRACE, __FILE__, __LINE__, __func__, __VA_ARGS__)
+
+#endif // LOGGING_H