Refactor scraper to use direct requests and bump to 0.8.18

- Replace session-based approach with direct requests calls
- Move headers to module-level DEFAULT_HEADERS constant
- Temporarily disable extra_property_data feature

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

homeharvest/core/scrapers/realtor/__init__.py

@@ -8,9 +8,8 @@ This module implements the scraper for realtor.com
 from __future__ import annotations
 
 import json
-import re
+import requests
 from concurrent.futures import ThreadPoolExecutor, as_completed
-from datetime import datetime
 from json import JSONDecodeError
 from typing import Dict, Union
 
@@ -22,7 +21,7 @@ from tenacity import (
     stop_after_attempt,
 )
 
-from .. import Scraper
+from .. import Scraper, DEFAULT_HEADERS
 from ....exceptions import AuthenticationError
 from ..models import (
     Property,
@@ -69,7 +68,12 @@ class RealtorScraper(Scraper):
             "variables": variables,
         }
 
-        response = self.session.post(self.SEARCH_GQL_URL, data=json.dumps(payload, separators=(',', ':')))
+        response = requests.post(
+            self.SEARCH_GQL_URL,
+            headers=DEFAULT_HEADERS,
+            data=json.dumps(payload, separators=(',', ':')),
+            proxies=self.proxies
+        )
 
         if response.status_code == 403:
             if not self.proxy: