refactor: review fixes and code improvements

- Add shared proxy module (bot/utils/proxy.py) to eliminate duplicate SOCKS5 parsing
- Fix AI client: escape HTML before Markdown→HTML conversion, unify timeouts,
  make health check optional and disabled by default, handle 429 retries
- Fix ai.py: correct forwarded message handling (aiogram 3.x forward_origin),
  pass relevant summaries via extra_system_content
- Fix dialogue.py: only respond to Astra's messages, use system context instead
  of prompt injection, answer on the limit message before phase transition
- Fix voice.py: load Whisper model in thread pool, safe WAV path generation
- Improve database.py: composite indexes, Boolean is_active, upsert file_id cache,
  add context cleanup helper
- Update weather.py and yadisk_download.py to use shared proxy connector
- Update yadisk.py: validate URL before cache clear, add download size limit,
  wrap sync file ops in to_thread
- Reuse S3 client via lru_cache
- Update setup_commands with /aiclear and /aiuser
- Update README, Dockerfile (Python 3.11), docker-compose (mount models)
- Pin dependency versions, remove unused httpx[socks]
- Add basic pytest tests for layout converter and voice normalization

main.py

@@ -19,6 +19,7 @@ from config import PROXY_ENABLED
 setup_logging()
 logger = logging.getLogger(__name__)
 
+# Router order matters: moderation first so it can delete messages before others process them.
 dp.include_router(moderation.router)
 dp.include_router(layout.router)
 dp.include_router(weather.router)
@@ -37,9 +38,9 @@ async def save_user_info(message: Message):
             message.from_user.username,
             message.from_user.full_name or "",
         )
-    except Exception:
-        pass
-    raise SkipHandler()
+    except Exception as exc:
+        logger.warning("Failed to save chat user: %s", exc)
+    raise SkipHandler
 
 
 async def main():
@@ -47,31 +48,41 @@ async def main():
     logging.info("База данных инициализирована")
     await setup_bot_commands()
 
-    asyncio.create_task(start_model_health_check())
+    health_check_task = asyncio.create_task(start_model_health_check())
 
     try:
         if PROXY_ENABLED:
             await setup_proxy()
         else:
             me = await bot.me()
-            logging.info(f"Бот запущен без прокси: @{me.username}")
-    except TelegramNetworkError as e:
+            logging.info("Бот запущен без прокси: @%s", me.username)
+    except TelegramNetworkError:
         if PROXY_ENABLED:
             logging.error("Не могу соединиться с прокси сервером. Попробуй другой прокси.")
         else:
             logging.error("Не могу соединиться с Telegram. Проверь интернет-соединение.")
+        health_check_task.cancel()
         return
-    except ClientConnectionError as e:
+    except ClientConnectionError:
         if PROXY_ENABLED:
             logging.error("Не могу соединиться с прокси сервером. Попробуй другой прокси.")
         else:
             logging.error("Не могу соединиться с Telegram. Проверь интернет-соединение.")
+        health_check_task.cancel()
         return
-    except Exception as e:
-        logging.error(f"Ошибка при запуске бота: {e}")
+    except Exception as exc:
+        logging.error("Ошибка при запуске бота: %s", exc)
+        health_check_task.cancel()
         return
 
-    await dp.start_polling(bot)
+    try:
+        await dp.start_polling(bot)
+    finally:
+        health_check_task.cancel()
+        try:
+            await health_check_task
+        except asyncio.CancelledError:
+            pass
 
 
 if __name__ == "__main__":