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/appexport/fabplan_test.go

@@ -22,7 +22,7 @@ type fabProv struct {
 	mounts  []string
 }
 
-func (p *fabProv) GetStackHDDPath(string) string    { return p.hddPath }
+func (p *fabProv) GetStackHDDPath(string) string     { return p.hddPath }
 func (p *fabProv) GetStackHDDMounts(string) []string { return p.mounts }
 func (p *fabProv) GetStackClassifiedBinds(string) ([]appbackup.ClassifiedBind, bool) {
 	return p.binds, p.has