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/services/series_parsing.go

@@ -17,10 +17,10 @@ import (
 
 // SeriesCandidate is one parsed series membership from any source.
 type SeriesCandidate struct {
-	Name     string
-	Sequence string  // raw sequence text ("3", "1.5", "1a", "Book 2")
-	Number   float64 // leading number of Sequence (0 = none parsed)
-	HasNum   bool
+	Name        string
+	Sequence    string  // raw sequence text ("3", "1.5", "1a", "Book 2")
+	Number      float64 // leading number of Sequence (0 = none parsed)
+	HasNum      bool
 	FromSidecar bool
 }