Add: Config for tool enable/disable, BETA warnings

Config system:
- 10 env vars to enable/disable each tool
- Disabled by default: get_deals_by_radius, get_street_deals, get_market_activity_metrics
- Enabled by default: all other tools

BETA warnings:
- analyze_market_trends: added BETA notice
- compare_addresses: added BETA notice

Tests:
- 17 tests skipped when tools disabled
- All 311 tests pass

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

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

tests/e2e/test_mcp_tools.py

@@ -11,6 +11,7 @@ import json
 
 import pytest
 
+from nadlan_mcp.config import get_config
 from nadlan_mcp.fastmcp_server import (
     autocomplete_address,
     find_recent_deals_for_address,
@@ -40,6 +41,9 @@ class TestMCPToolsSmokeTests:
 
     def test_get_street_deals_works(self):
         """Smoke test: Can fetch street deals."""
+
+        if not get_config().tool_get_street_deals_enabled:
+            pytest.skip("test_get_street_deals tool is disabled")
         # Use small limit for speed
         result = get_street_deals(self.TEST_POLYGON_ID, limit=5, deal_type=2)
         data = json.loads(result)
@@ -50,6 +54,9 @@ class TestMCPToolsSmokeTests:
 
     def test_get_deals_by_radius_works(self):
         """Smoke test: Can fetch polygon metadata by radius."""
+
+        if not get_config().tool_get_deals_by_radius_enabled:
+            pytest.skip("test_get_deals_by_radius tool is disabled")
         # Use small radius for speed
         result = get_deals_by_radius(self.TEST_LAT, self.TEST_LON, radius_meters=100)
         data = json.loads(result)