style: apply gofmt across Go sources

Repo-wide gofmt sweep: const-block alignment, doc-comment spacing,
statement-after-brace fix in media.go, trailing blank lines. No
semantic changes — whitespace-insensitive diff is empty for every
file in this commit.

internal/setupstatus/status.go

@@ -29,7 +29,7 @@ var (
 	cacheMu       sync.RWMutex
 	cacheComplete bool = true
 	cacheExpiry   time.Time
-	cacheTTL           = 10 * time.Second
+	cacheTTL      = 10 * time.Second
 )
 
 // IsSetupComplete reports whether setup is complete. Setup is complete when at