feat: integrate TUI module and apply professional refactoring

include/timing.h

@@ -1,10 +1,3 @@
-/**
- * @file timing.h
- * @brief High-precision timing utilities
- * @author ASCII3D Project
- * @version 1.0.0
- */
-
 #ifndef ASCII3D_TIMING_H
 #define ASCII3D_TIMING_H
 
@@ -12,27 +5,18 @@
 extern "C" {
 #endif
 
-/**
- * @brief Get current time in seconds (monotonic clock)
- * @return Time in seconds with nanosecond precision
- */
+// Returns the monotonic wall clock time in seconds, suitable for frame timing.
 double timing_get_seconds(void);
 
-/**
- * @brief Sleep for specified microseconds
- * @param microseconds Duration to sleep
- */
+// Microsecond-scale thread suspension layer.
 void timing_sleep_us(unsigned int microseconds);
 
-/**
- * @brief Frame rate limiter - sleeps to maintain target FPS
- * @param frame_start_time Time when frame started (from timing_get_seconds)
- * @param target_fps Target frames per second
- */
+// Calculates dynamic sleep padding against a target FPS to prevent high CPU
+// utilization
 void timing_limit_fps(double frame_start_time, int target_fps);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* ASCII3D_TIMING_H */
+#endif