refactor(structure): normalize folder names with leading zeros for consistency

- Renamed all folders from format NEx (e.g., 1Ex, 2Ex...) to 0NEx (01Ex, 02Ex, etc.)
- Updated subdirectories and files accordingly
- Removed old main Makefile and tasks (a01.c–a09.c, solve.c, io_status.h), likely obsolete
- Cleaned up deprecated task binaries and configs

2025.03.07/6Ex/solve.c

@@ -1,15 +0,0 @@
-#include "solve.h"
-#include "math.h"
-
-void t6_solve(double *a, int n, int m, int i, int j)
-{
-	double temp;
-	int k;
-	(void)n;
-	for (k = 0; k < m; k++)
-	{
-		temp = a[i * m + k];
-		a[i * m + k] = a[j * m + k];
-		a[j * m + k] = temp;
-	}
-}