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

2025.03.07/08Ex/solve.c

@@ -0,0 +1,10 @@
+#include "solve.h"
+#include "math.h"
+
+void t8_solve(double *a, int n, int m, int i, int j, double g)
+{
+	int k;
+	(void)n;
+	for (k = 0; k < m; k++)
+		a[j * m + k] += a[i * m + k] * g;
+}