fix: fix VFS Delete op for Ramdisk driver

kernel/src/Fs/Ramdisk.cpp

@@ -374,24 +374,40 @@ namespace Fs::Ramdisk {
 
     int Delete(const char* path) {
         if (path == nullptr) return -1;
-        if (path[0] == '/') path++;
 
-        for (int i = 0; i < fileCount; i++) {
-            if (StrEqual(fileTable[i].name, path)) {
-                // Free heap-allocated data
-                if (fileTable[i].heapAllocated && fileTable[i].data) {
-                    Memory::g_heap->Free(fileTable[i].data);
-                }
+        int idx = FindEntryByPath(path);
+        if (idx < 0) return -1;
 
-                // Shift remaining entries down
-                for (int j = i; j < fileCount - 1; j++) {
-                    fileTable[j] = fileTable[j + 1];
+        // For directories, refuse if any other entry lives under this prefix.
+        if (fileTable[idx].isDirectory) {
+            char normalized[MaxNameLen];
+            int normLen = NormalizePath(path, normalized, MaxNameLen);
+            if (normLen < 0) return -1;
+            if (normLen + 1 >= MaxNameLen) return -1;
+            normalized[normLen] = '/';
+            normalized[normLen + 1] = '\0';
+
+            for (int i = 0; i < fileCount; i++) {
+                if (i == idx) continue;
+                const char* name = fileTable[i].name;
+                if (name[0] == '/') name++;
+                bool prefixMatch = true;
+                for (int k = 0; k <= normLen; k++) {
+                    if (name[k] != normalized[k]) { prefixMatch = false; break; }
                 }
-                fileCount--;
-                return 0;
+                if (prefixMatch && name[normLen + 1] != '\0') return -1;
             }
         }
-        return -1;  // not found
+
+        if (fileTable[idx].heapAllocated && fileTable[idx].data) {
+            Memory::g_heap->Free(fileTable[idx].data);
+        }
+
+        for (int j = idx; j < fileCount - 1; j++) {
+            fileTable[j] = fileTable[j + 1];
+        }
+        fileCount--;
+        return 0;
     }
 
     int Mkdir(const char* path) {