style: gofmt normalization — no logic changes

gofmt -w across the controller tree (46 files) so gofmt -l is empty — disarms the
formatting landmine where a targeted edit + accidental gofmt -w swept ~46 unrelated
files. Pure formatting: whitespace + gofmt's optional-semicolon removal in reflowed
inline closures. One doc comment reworded ('' -> 'the empty string') to avoid gofmt's
Go-1.19 doc-comment typographic substitition ('' -> curly quote) muddying its meaning.
No build/vet/test behavior change.

controller/internal/web/app_export_domain_test.go

@@ -59,8 +59,8 @@ func TestAppExportDomainUsesCustomerDomainNotCSRFToken(t *testing.T) {
 	}
 }
 
-// The empty-subdomain branch still yields '' — an app without a subdomain must not get a link to
-// a bare domain (the truthiness guard is what produces that, and the fix must not disturb it).
+// The empty-subdomain branch still yields the empty string — an app without a subdomain must not get
+// a link to a bare domain (the truthiness guard is what produces that, and the fix must not disturb it).
 func TestAppExportDomainEmptyWithoutSubdomain(t *testing.T) {
 	line := exportScriptLine(t, renderExport(t, ""))