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/filebrowser_gate_test.go

@@ -13,8 +13,8 @@ func TestSkipFileBrowserPath(t *testing.T) {
 		path string
 		want bool
 	}{
-		{StableParentDir + "/flash", false},  // external + mounted → keep
-		{StableParentDir + "/usb", true},     // external + NOT mounted → skip
+		{StableParentDir + "/flash", false},   // external + mounted → keep
+		{StableParentDir + "/usb", true},      // external + NOT mounted → skip
 		{"/mnt/sys_drive/felhom-data", false}, // system path (not under StableParentDir) → never skip
 	}
 	for _, c := range cases {
@@ -34,9 +34,9 @@ func TestFbNeedsRecreate(t *testing.T) {
 	compose := []byte("services:\n  filebrowser:\n    image: x\n")
 
 	cases := []struct {
-		name                             string
-		oldCfg, newCfg, oldCmp, newCmp   []byte
-		want                             bool
+		name                           string
+		oldCfg, newCfg, oldCmp, newCmp []byte
+		want                           bool
 	}{
 		{"unchanged → no recreate", cfg, cfg, compose, compose, false},
 		{"config differs → recreate", cfg, []byte("sources:\n  - /srv/hdd\n"), compose, compose, true},