feat: add IP geolocation service with caching

geolocation.py

+import asyncio
+import httpx
+from typing import Dict, Optional
+
+# Global cache for IP -> country mappings
+_ip_country_cache: Dict[str, str] = {}
+
+async def get_ip_country(ip: str) -> Optional[str]:
+    """Get country code for IP address using ipapi.co, with caching.
+    
+    Returns country code (e.g., 'IL') or None if failed.
+    """
+    if ip in _ip_country_cache:
+        return _ip_country_cache[ip]
+    
+    try:
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            response = await client.get(f"http://ipapi.co/{ip}/country/")
+            if response.status_code == 200:
+                country = response.text.strip().upper()
+                _ip_country_cache[ip] = country
+                return country
+    except Exception:
+        pass
+    
+    # Cache failure to avoid repeated calls
+    _ip_country_cache[ip] = None
+    return None
+
+def is_ip_israeli(ip: str) -> bool:
+    """Check if IP is from Israel."""
+    # Run async function in sync context if needed
+    try:
+        loop = asyncio.get_event_loop()
+        if loop.is_running():
+            # If loop is running, we can't use run_until_complete
+            # For middleware, we'll need to handle this differently
+            return False  # Temporary fallback
+        else:
+            country = loop.run_until_complete(get_ip_country(ip))
+            return country == 'IL'
+    except Exception:
+        return False
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