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/netstorage_gate_test.go

@@ -49,7 +49,10 @@ func TestNetAddGate_OldAgent_RefusedUpFront(t *testing.T) {
 		verifyErr: &agentapi.StatusError{Path: "/netstorage/verify-status", Code: http.StatusNotFound},
 	}
 	s.netAgentFn = func() (netAgent, error) { return agent, nil }
-	s.netProbeFn = func(context.Context, string) probeOutcome { t.Error("probe must never run on a gated add"); return probeOutcome{} }
+	s.netProbeFn = func(context.Context, string) probeOutcome {
+		t.Error("probe must never run on a gated add")
+		return probeOutcome{}
+	}
 
 	w := postNetAdd(t, s, "media")
 	if w.Code != http.StatusPreconditionFailed {