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

2025.03.07/1Ex/init_f.c

@@ -1,30 +0,0 @@
-#include "init_f.h"
-#include <math.h>
-
-#define MAX(n, m) (n < m ? m : n)
-
-double f1(int n, int m, int i, int j)
-{
-	return MAX(n, m) - MAX(i, j) + 1;
-}
-
-double f2(int n, int m, int i, int j)
-{
-	(void)n;
-	(void)m;
-	return MAX(i, j);
-}
-
-double f3(int n, int m, int i, int j)
-{
-	(void)n;
-	(void)m;
-	return abs(i - j);
-}
-
-double f4(int n, int m, int i, int j)
-{
-	(void)n;
-	(void)m;
-	return 1./(i+j-1);
-}