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/WordList.jsx

@@ -1,9 +1,11 @@
 import React, { useState, useEffect } from 'react'
+import { useAuth } from './auth/AuthContext'
 import './WordList.css'
 
 const API_URL = '/api'
 
 function WordList({ onNavigate, dictionaryId, isNewDictionary, refreshTrigger = 0 }) {
+  const { authFetch } = useAuth()
   const [words, setWords] = useState([])
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState('')
@@ -44,7 +46,7 @@ function WordList({ onNavigate, dictionaryId, isNewDictionary, refreshTrigger =
 
   const fetchDictionary = async (dictId) => {
     try {
-      const response = await fetch(`${API_URL}/dictionaries`)
+      const response = await authFetch(`${API_URL}/dictionaries`)
       if (!response.ok) {
         throw new Error('Ошибка при загрузке словарей')
       }
@@ -74,7 +76,7 @@ function WordList({ onNavigate, dictionaryId, isNewDictionary, refreshTrigger =
     try {
       setLoading(true)
       const url = `${API_URL}/words?dictionary_id=${dictId}`
-      const response = await fetch(url)
+      const response = await authFetch(url)
       if (!response.ok) {
         throw new Error('Ошибка при загрузке слов')
       }
@@ -102,7 +104,7 @@ function WordList({ onNavigate, dictionaryId, isNewDictionary, refreshTrigger =
     try {
       if (!hasValidDictionary(currentDictionaryId)) {
         // Create new dictionary
-        const response = await fetch(`${API_URL}/dictionaries`, {
+        const response = await authFetch(`${API_URL}/dictionaries`, {
           method: 'POST',
           headers: {
             'Content-Type': 'application/json',
@@ -131,7 +133,7 @@ function WordList({ onNavigate, dictionaryId, isNewDictionary, refreshTrigger =
         onNavigate?.('words', { dictionaryId: newDictionaryId })
       } else if (hasValidDictionary(currentDictionaryId)) {
         // Update existing dictionary (rename)
-        const response = await fetch(`${API_URL}/dictionaries/${currentDictionaryId}`, {
+        const response = await authFetch(`${API_URL}/dictionaries/${currentDictionaryId}`, {
           method: 'PUT',
           headers: {
             'Content-Type': 'application/json',