Create multi-frontend architecture with qt6, nextjs, and cli frontends

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

frontends/cli/src/file_utils.cpp

@@ -0,0 +1,47 @@
+#include "file_utils.h"
+#include <fstream>
+#include <sstream>
+#include <sys/stat.h>
+
+bool FileUtils::readLines(const std::string& filePath, std::vector<std::string>& lines) {
+    std::ifstream file(filePath);
+    if (!file.is_open()) {
+        return false;
+    }
+
+    lines.clear();
+    std::string line;
+    while (std::getline(file, line)) {
+        lines.push_back(line);
+    }
+
+    file.close();
+    return true;
+}
+
+bool FileUtils::writeLines(const std::string& filePath, const std::vector<std::string>& lines) {
+    std::ofstream file(filePath);
+    if (!file.is_open()) {
+        return false;
+    }
+
+    for (const auto& line : lines) {
+        file << line << "\n";
+    }
+
+    file.close();
+    return true;
+}
+
+bool FileUtils::fileExists(const std::string& filePath) {
+    struct stat buffer;
+    return (stat(filePath.c_str(), &buffer) == 0);
+}
+
+long FileUtils::getFileSize(const std::string& filePath) {
+    struct stat buffer;
+    if (stat(filePath.c_str(), &buffer) != 0) {
+        return -1;
+    }
+    return buffer.st_size;
+}