initialize git, basic setup for crm

src/utils/errors.js

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+/**
+ * Custom error classes pre aplikáciu
+ */
+
+export class AppError extends Error {
+  constructor(message, statusCode = 500, details = null) {
+    super(message);
+    this.statusCode = statusCode;
+    this.details = details;
+    this.isOperational = true;
+
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+export class ValidationError extends AppError {
+  constructor(message, details = null) {
+    super(message, 400, details);
+    this.name = 'ValidationError';
+  }
+}
+
+export class AuthenticationError extends AppError {
+  constructor(message = 'Neautorizovaný prístup') {
+    super(message, 401);
+    this.name = 'AuthenticationError';
+  }
+}
+
+export class ForbiddenError extends AppError {
+  constructor(message = 'Prístup zamietnutý') {
+    super(message, 403);
+    this.name = 'ForbiddenError';
+  }
+}
+
+export class NotFoundError extends AppError {
+  constructor(message = 'Nenájdené') {
+    super(message, 404);
+    this.name = 'NotFoundError';
+  }
+}
+
+export class ConflictError extends AppError {
+  constructor(message = 'Konflikt') {
+    super(message, 409);
+    this.name = 'ConflictError';
+  }
+}
+
+export class RateLimitError extends AppError {
+  constructor(message = 'Príliš veľa požiadaviek') {
+    super(message, 429);
+    this.name = 'RateLimitError';
+  }
+}
+
+/**
+ * Error response formatter
+ * @param {Error} error
+ * @param {boolean} includeStack - Či má zahrnúť stack trace (len development)
+ * @returns {Object} Formatted error response
+ */
+export const formatErrorResponse = (error, includeStack = false) => {
+  const response = {
+    success: false,
+    error: {
+      message: error.message || 'Interná chyba servera',
+      statusCode: error.statusCode || 500,
+    },
+  };
+
+  if (error.details) {
+    response.error.details = error.details;
+  }
+
+  if (includeStack && process.env.NODE_ENV === 'development') {
+    response.error.stack = error.stack;
+  }
+
+  return response;
+};