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/sync/sync.go

@@ -51,10 +51,10 @@ type SyncStatus struct {
 
 // SyncResult holds the result of a single sync operation.
 type SyncResult struct {
-	OK       bool     `json:"ok"`
-	NewApps  []string `json:"new_apps,omitempty"`
-	Updated  []string `json:"updated,omitempty"`
-	Message  string   `json:"message"`
+	OK      bool     `json:"ok"`
+	NewApps []string `json:"new_apps,omitempty"`
+	Updated []string `json:"updated,omitempty"`
+	Message string   `json:"message"`
 }
 
 // New creates a new Syncer. rescanFn is called after a successful sync to trigger ScanStacks().