fix: make instagrapi import lazy to prevent app crash if missing

src/vk_parser_app/workers/insta_parser.py

@@ -8,14 +8,23 @@ import time
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
 
-from instagrapi import Client
-from instagrapi.exceptions import (
-    ChallengeRequired,
-    PleaseWaitFewMinutes,
-    LoginRequired,
-    UserNotFound,
-    PrivateAccount
-)
+try:
+    from instagrapi import Client
+    from instagrapi.exceptions import (
+        ChallengeRequired,
+        PleaseWaitFewMinutes,
+        LoginRequired,
+        UserNotFound,
+        PrivateAccount
+    )
+except ImportError:
+    Client = None
+    ChallengeRequired = Exception
+    PleaseWaitFewMinutes = Exception
+    LoginRequired = Exception
+    UserNotFound = Exception
+    PrivateAccount = Exception
+
 from loguru import logger
 
 from ..config import settings
@@ -240,6 +249,10 @@ class InstaParserWorker:
     def setup_client(self, login: str, password: str, proxy: str | None) -> bool:
         if self.client:
             return True
+            
+        if Client is None:
+            logger.error("instagrapi is not installed! Cannot setup client.")
+            raise Exception("Module instagrapi is not installed. Please install it.")
         
         self.client = Client()
         if proxy: