Replace per-source enable booleans with SourcePrecheck and bump SDK to v1.9.0

Sources that always work (botvrij, disconnect, oisd, openphish, phishtank, quad9) drop their user-facing enable_* option; the rule's enabled/disabled state is now solely controlled by the SDK rule toggle. Sources that require credentials (criminalip, malwarebazaar, otx, pulsedive, safebrowsing, threatfox, urlhaus, virustotal) instead implement the new SourcePrecheck interface so the host UI can surface "not configured" before attempting a query.

checker/phishtank.go

@@ -40,20 +40,11 @@ func (*phishTankSource) Options() SourceOptions {
 				Default:     "12",
 			},
 		},
-		User: []sdk.CheckerOptionField{
-			{
-				Id:          "enable_phishtank",
-				Type:        "bool",
-				Label:       "Use the PhishTank feed",
-				Description: "Download the PhishTank verified phishing list and check the domain against it.",
-				Default:     true,
-			},
-		},
 	}
 }
 
 func (s *phishTankSource) Query(ctx context.Context, domain, registered string, opts sdk.CheckerOptions) []SourceResult {
-	if !sdk.GetBoolOption(opts, "enable_phishtank", true) || registered == "" {
+	if registered == "" {
 		return disabledResult(s.ID(), s.Name())
 	}