refactor: complete structlog migration with contextvars, kwargs, and logging hardening

- Add ContextVarsMiddleware for automatic user_id/chat_id/username binding
  via structlog contextvars (aiogram) and http_method/http_path (FastAPI)
- Use bound_contextvars() context manager instead of clear_contextvars()
  to safely restore previous state instead of wiping all context
- Register ContextVarsMiddleware as outermost middleware (before GlobalError)
  so all error logs include user context
- Replace structlog.get_logger() with structlog.get_logger(__name__) across
  270 calls in 265 files for meaningful logger names
- Switch wrapper_class from BoundLogger to make_filtering_bound_logger()
  for pre-processor level filtering (performance optimization)
- Migrate 1411 %-style positional arg logger calls to structlog kwargs
  style across 161 files via AST script
- Migrate log_rotation_service.py from stdlib logging to structlog
- Add payment module prefixes to TelegramNotifierProcessor.IGNORED_LOGGER_PREFIXES
  and ExcludePaymentFilter.PAYMENT_MODULES to prevent payment data leaking
  to Telegram notifications and general log files
- Fix LoggingMiddleware: add from_user null-safety for channel posts,
  switch time.time() to time.monotonic() for duration measurement
- Remove duplicate logger assignments in purchase.py, config.py,
  inline.py, and admin/payments.py

app/webapi/server.py

@@ -1,8 +1,8 @@
 from __future__ import annotations
 
 import asyncio
-import logging
 
+import structlog
 import uvicorn
 
 from app.config import settings
@@ -10,7 +10,7 @@ from app.config import settings
 from .app import create_web_api_app
 
 
-logger = logging.getLogger(__name__)
+logger = structlog.get_logger(__name__)
 
 
 class WebAPIServer:
@@ -76,13 +76,11 @@ class WebAPIServer:
             try:
                 await self._server.serve()
             except Exception as error:  # pragma: no cover - логируем ошибки сервера
-                logger.exception('❌ Ошибка работы веб-API: %s', error)
+                logger.exception('❌ Ошибка работы веб-API', error=error)
                 raise
 
         logger.info(
-            '🌐 Запуск административного API на %s:%s',
-            settings.WEB_API_HOST,
-            settings.WEB_API_PORT,
+            '🌐 Запуск административного API на', WEB_API_HOST=settings.WEB_API_HOST, WEB_API_PORT=settings.WEB_API_PORT
         )
         self._task = asyncio.create_task(_serve(), name='web-api-server')