fix(tg): reviewer fixes — error handling, timeouts, db index

- commands.py: try/except TelegramBadRequest around all Bot API calls (#2);
  /new handles "topics limit" with user-friendly message (#4)
- start.py: isolate _check_and_prune_stale_topics with try/except Exception (#3)
- message.py: asyncio.timeout(30) around stream_message; handle TimeoutError (#6)
- db.py: add idx_chats_user_id index in init_db() (#7)
- settings.py: remove dead active_chat_id variable (#8)
- tests: add test_message.py (stream error/success); add 2 tests in test_commands.py
  (topics limit, /archive in General topic)

adapter/telegram/handlers/commands.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import structlog
 from aiogram import Router
+from aiogram.exceptions import TelegramBadRequest
 from aiogram.filters import Command
 from aiogram.types import Message
 
@@ -20,7 +21,15 @@ async def cmd_new(message: Message) -> None:
     chat_id = message.chat.id
     n = db.count_active_chats(user_id) + 1
     new_name = f"Чат #{n}"
-    topic = await message.bot.create_forum_topic(chat_id=chat_id, name=new_name)
+    try:
+        topic = await message.bot.create_forum_topic(chat_id=chat_id, name=new_name)
+    except TelegramBadRequest as e:
+        if "topics limit" in str(e).lower():
+            await message.answer("Достигнут лимит топиков (1000). Заархивируй неиспользуемые чаты.")
+        else:
+            logger.error("cmd_new_failed", error=str(e))
+            await message.answer("Не удалось создать чат, попробуй позже.")
+        return
     thread_id = topic.message_thread_id
     db.create_chat(user_id=user_id, thread_id=thread_id, chat_name=new_name)
     await message.bot.send_message(
@@ -40,7 +49,10 @@ async def cmd_archive(message: Message) -> None:
     if chat is None or chat["archived_at"] is not None:
         await message.answer("Этот чат не найден или уже архивирован.")
         return
-    await message.bot.close_forum_topic(chat_id=message.chat.id, message_thread_id=thread_id)
+    try:
+        await message.bot.close_forum_topic(chat_id=message.chat.id, message_thread_id=thread_id)
+    except TelegramBadRequest as e:
+        logger.warning("cmd_archive_bot_error", error=str(e))
     db.archive_chat(user_id=user_id, thread_id=thread_id)
     logger.info("cmd_archive", user_id=user_id, thread_id=thread_id)
 
@@ -59,11 +71,16 @@ async def cmd_rename(message: Message) -> None:
     if chat is None:
         await message.answer("Этот чат не найден.")
         return
-    await message.bot.edit_forum_topic(
-        chat_id=message.chat.id,
-        message_thread_id=thread_id,
-        name=new_name[:128],
-    )
+    try:
+        await message.bot.edit_forum_topic(
+            chat_id=message.chat.id,
+            message_thread_id=thread_id,
+            name=new_name[:128],
+        )
+    except TelegramBadRequest as e:
+        logger.error("cmd_rename_failed", error=str(e))
+        await message.answer("Не удалось переименовать топик.")
+        return
     db.rename_chat(user_id=user_id, thread_id=thread_id, new_name=new_name[:128])
     logger.info("cmd_rename", user_id=user_id, thread_id=thread_id, new_name=new_name)