gofmt: bring internal/ and cmd/ back to gofmt -l clean

Mechanical `gofmt -w ./internal ./cmd`. Mostly struct-field realignment that
had drifted, plus a few trailing-newline fixes. No behaviour change — gofmt is
semantics-preserving, and build/vet/test are green either side.

Split out from the code-review fixes that follow so those stay reviewable
instead of hiding inside a wall of realignment.

internal/plugin/adventure_twinbee.go

@@ -322,11 +322,11 @@ func (p *AdventurePlugin) distributeTwinBeeRewards(result *TwinBeeResult) TwinBe
 // ── TwinBee Gifts (Temporary Buffs) ──────────────────────────────────────────
 
 type twinBeeGiftDef struct {
-	BuffType  string
-	BuffName  string
-	Modifier  float64
-	Duration  time.Duration
-	Flavor    string
+	BuffType string
+	BuffName string
+	Modifier float64
+	Duration time.Duration
+	Flavor   string
 }
 
 var twinBeeGifts = []twinBeeGiftDef{