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/appbackup/dbdump.go

@@ -764,7 +764,8 @@ func getMariaDBPassword(ctx context.Context, containerID string) string {
 //   - else known[containerName]   → containerName (the container name IS the stack — don't strip, e.g. my-cache).
 //   - else longest known prefix   → handles <stack>_postgres / <stack>-1 / compose-suffixed names.
 //   - else                        → candidate (fall back to today's suffix-strip; preserves behaviour when
-//                                    the stack list is empty/unavailable, so nothing regresses).
+//     the stack list is empty/unavailable, so nothing regresses).
+//
 // A nil/empty `known` map = the legacy fast path (pure suffix-strip).
 func deriveStackName(containerName string, known map[string]bool) string {
 	candidate := suffixStripStackName(containerName)