feat: make scraper and job service account-aware

- OptimizedTelegramScraper accepts account_id parameter;
  sets DATA_DIR to data/accounts/<id>/ when provided
- Session path uses account_session_path() for per-account session files
- initialize_client() reads per-account credentials from account state store
- ScraperJobService passes account_id from payload to scraper constructor
- Per-account state loaded from AccountStateStore before scraping

scraper_jobs.py

@@ -1,6 +1,6 @@
 import asyncio
 import logging
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Optional
 
 from app_state import StateStore
 
@@ -25,12 +25,21 @@ class ScraperJobService:
         asyncio.run(self._run_async(job_type, payload))
 
     async def _run_async(self, job_type: str, payload: Dict[str, Any]) -> None:
+        # Extract account_id from payload, default to None (legacy)
+        account_id: Optional[str] = payload.get("account_id")
         ScraperClass = self._import_scraper_class()
-        scraper = ScraperClass()
+        scraper = ScraperClass(account_id=account_id)
+
+        if account_id:
+            from app_state import load_account
+            acc_state = load_account(self.state_store.path.parent, account_id)
+            # Load per-account state into scraper state
+            scraper.state = acc_state
+
         initialized = await scraper.initialize_client(interactive=False)
         if not initialized:
             raise RuntimeError(
-                "Telegram client is not ready. Check credentials, session, and write access to /app/session."
+                "Telegram client is not ready. Check credentials, session, and write access."
             )
         try:
             if job_type == "scrape_channel":