Add persisted target registry for Cursor golden profiles.

Targets save to PFSENSE_TARGETS_PATH so golden-pfsense and other firewalls reload across MCP sessions.

src/pfsense_mcp/config.py

@@ -23,6 +23,7 @@ class Settings(BaseSettings):
     require_description_prefix: str = "mcp:"
     block_wan_inbound_any: bool = True
     audit_log_path: str = "/root/.hermes/logs/pfsense-mcp-audit.jsonl"
+    targets_path: str = "~/.local/share/pfsense-mcp/targets.json"
 
 
 settings = Settings()