feat(14-03): wire 5 frontend leak sources in RegisterAll (40 -> 45 sources)

- Register SourceMapSource, WebpackSource, EnvLeakSource, SwaggerSource, DeployPreviewSource
- Update test expectations from 40 to 45 sources

pkg/recon/sources/integration_test.go

@@ -641,8 +641,8 @@ func TestRegisterAll_Phase12(t *testing.T) {
 	})
 
 	names := eng.List()
-	if n := len(names); n != 40 {
-		t.Fatalf("expected 40 sources from RegisterAll, got %d: %v", n, names)
+	if n := len(names); n != 45 {
+		t.Fatalf("expected 45 sources from RegisterAll, got %d: %v", n, names)
 	}
 
 	// Build lookup for source access.