feat: мини-игры, premium подписка, улучшенные контексты

Мини-игры (/games):
- Speed Round: 10 раундов, 10 секунд на ответ, очки за скорость
- Match Pairs: 5 слов + 5 переводов, соединить пары

Premium-функции:
- Поля is_premium и premium_until для пользователей
- AI режим проверки ответов (учитывает синонимы)
- Batch проверка всех ответов одним запросом

Улучшения:
- Примеры использования для всех добавляемых слов
- Разбиение переводов по запятой на отдельные записи
- Полные предложения в контекстах (без ___)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

locales/en.json

@@ -6,6 +6,7 @@
     "task": "🧠 Task",
     "practice": "💬 Practice",
     "exercises": "📖 Exercises",
+    "games": "🎮 Mini Games",
     "words": "🎯 Thematic words",
     "import": "📖 Import",
     "stats": "📊 Stats",
@@ -428,5 +429,63 @@
     "score": "Score: {correct} of {total}",
     "no_topics": "No topics available for your level yet.",
     "write_answer": "Write your answer:"
+  },
+  "minigames": {
+    "menu_title": "🎮 <b>Mini Games</b>\n\nChoose a game:",
+    "start_btn": "Start",
+    "back_btn": "Back",
+    "play_again": "Play again",
+    "speed_round": {
+      "name": "Speed Translation",
+      "rules": "📋 <b>Rules:</b>\n\n• A word from your vocabulary appears\n• You have {time} seconds to answer\n• Type the translation as fast as you can\n• Faster = more points!\n\n🎯 Rounds: {count}",
+      "mode_ai": "AI Check Mode",
+      "mode_simple": "Simple Mode",
+      "premium_hint": "You have a subscription! Choose answer checking mode.",
+      "ai_mode_warning": "⚠️ <b>AI Check Mode</b>\n\nIn this mode AI will check all answers <b>after the game ends</b>.\nDuring the game, answers are checked against dictionary.\n\nAI considers synonyms and translation variations.",
+      "ai_checking": "AI is checking answers",
+      "not_enough_words": "❌ Not enough words in vocabulary\n\nMinimum: {min} words\nYou have: {current}\n\nAdd words via /add or /words",
+      "round": "Round {current}/{total}",
+      "seconds": "sec",
+      "score": "Score",
+      "points": "points",
+      "time_up": "Time's up!",
+      "correct": "Correct!",
+      "wrong": "Wrong!",
+      "correct_was": "Correct answer",
+      "finished": "Game Over!",
+      "final_score": "Final score",
+      "correct_answers": "Correct answers",
+      "accuracy": "Accuracy",
+      "answers_list": "Answers",
+      "result": {
+        "excellent": "🔥 Excellent! You're a master!",
+        "good": "👏 Great result! Keep it up!",
+        "average": "📚 Not bad! Keep practicing.",
+        "practice": "💪 Don't give up! Practice makes perfect."
+      }
+    },
+    "match_game": {
+      "name": "Match Pairs",
+      "rules": "📋 <b>Rules:</b>\n\n• {count} words and {count} translations will appear shuffled\n• Match the correct pairs\n• Enter answer in format: 1A, 2B, 3C...\n• Time is tracked",
+      "title": "Match the pairs",
+      "words_col": "Words",
+      "translations_col": "Translations",
+      "hint": "Enter pairs (e.g.: 1C, 2A, 3B, 4D, 5E)",
+      "cancel": "Cancel",
+      "cancelled": "❌ Game cancelled",
+      "not_enough_words": "❌ Not enough words in vocabulary\n\nMinimum: {min} words\nYou have: {current}\n\nAdd words via /add or /words",
+      "not_all_pairs": "⚠️ Enter all pairs!\n\nEntered: {entered}\nNeeded: {needed}",
+      "finished": "Game Over!",
+      "score": "Score",
+      "correct_pairs": "Correct pairs",
+      "time": "Time",
+      "results": "Results",
+      "result": {
+        "perfect": "🎯 Perfect! All pairs correct!",
+        "excellent": "🔥 Excellent! Almost flawless!",
+        "good": "👍 Good result!",
+        "practice": "💪 Keep practicing!"
+      }
+    }
   }
 }