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

2025.03.07/4Ex/solve.c

@@ -1,15 +0,0 @@
-#include "solve.h"
-#include "math.h"
-
-void t4_solve(double *a, int n)
-{
-	double temp;
-	int i, j;
-	for (i = 0; i < n; i++)
-		for (j = i; j < n; j++)
-			if (i != j) {
-				temp = a[i * n + j];
-				a[i * n + j] = (a[j * n + i] + temp) / 2;
-				a[j * n + i] = (a[j * n + i] + temp) / 2;
-			}		
-}