v2.0.0: Multi-user authentication with JWT

Features:
- User registration and login with JWT tokens
- All data is now user-specific (multi-tenancy)
- Profile page with integrations and logout
- Automatic migration of existing data to first user

Backend changes:
- Added users and refresh_tokens tables
- Added user_id to all data tables (projects, entries, nodes, dictionaries, words, progress, configs, telegram_integrations, weekly_goals)
- JWT authentication middleware
- claimOrphanedData() for data migration

Frontend changes:
- AuthContext for state management
- Login/Register forms
- Profile page (replaced Integrations)
- All API calls use authFetch with Bearer token

Migration notes:
- On first deploy, backend automatically adds user_id columns
- First user to login claims all existing data

play-life-web/src/components/AddConfig.jsx

@@ -1,9 +1,11 @@
 import React, { useState, useEffect } from 'react'
+import { useAuth } from './auth/AuthContext'
 import './AddConfig.css'
 
 const API_URL = '/api'
 
 function AddConfig({ onNavigate, editingConfig: initialEditingConfig }) {
+  const { authFetch } = useAuth()
   const [name, setName] = useState('')
   const [tryMessage, setTryMessage] = useState('')
   const [wordsCount, setWordsCount] = useState('10')
@@ -19,7 +21,7 @@ function AddConfig({ onNavigate, editingConfig: initialEditingConfig }) {
     const loadDictionaries = async () => {
       setLoadingDictionaries(true)
       try {
-        const response = await fetch(`${API_URL}/test-configs-and-dictionaries`)
+        const response = await authFetch(`${API_URL}/test-configs-and-dictionaries`)
         if (!response.ok) {
           throw new Error('Ошибка при загрузке словарей')
         }
@@ -39,7 +41,7 @@ function AddConfig({ onNavigate, editingConfig: initialEditingConfig }) {
     const loadSelectedDictionaries = async () => {
       if (initialEditingConfig?.id) {
         try {
-          const response = await fetch(`${API_URL}/configs/${initialEditingConfig.id}/dictionaries`)
+          const response = await authFetch(`${API_URL}/configs/${initialEditingConfig.id}/dictionaries`)
           if (response.ok) {
             const data = await response.json()
             setSelectedDictionaryIds(Array.isArray(data.dictionary_ids) ? data.dictionary_ids : [])
@@ -100,7 +102,7 @@ function AddConfig({ onNavigate, editingConfig: initialEditingConfig }) {
         : `${API_URL}/configs`
       const method = initialEditingConfig ? 'PUT' : 'POST'
 
-      const response = await fetch(url, {
+      const response = await authFetch(url, {
         method: method,
         headers: {
           'Content-Type': 'application/json',