Convert quaff to a per-potion handler table (refactor step 7)

The quaff switch becomes gameData.quaffHandlers, a method-expression
table indexed by PotionKind; each case body moved verbatim into a
quaff* method. Effect order and RNG call sequence unchanged.

game/tables.go

@@ -122,6 +122,11 @@ type gameData struct {
 
 	// scoreReasons is the rip.c reason[] scoreboard strings.
 	scoreReasons [4]string
+
+	// quaffHandlers dispatches each potion kind to its effect method:
+	// the cases of the potions.c quaff switch. The bool is trip — was
+	// the hero hallucinating when the potion went down.
+	quaffHandlers [NumPotionTypes]func(g *RogueGame, trip bool)
 }
 
 // ripWall is the repeated blank wall line of the tombstone art.
@@ -587,6 +592,23 @@ func newGameData() *gameData {
 			"A total winner",
 			"killed with Amulet",
 		},
+
+		quaffHandlers: [NumPotionTypes]func(*RogueGame, bool){
+			PotionConfusion:       (*RogueGame).quaffConfusion,
+			PotionLSD:             (*RogueGame).quaffLSD,
+			PotionPoison:          (*RogueGame).quaffPoison,
+			PotionGainStrength:    (*RogueGame).quaffGainStrength,
+			PotionSeeInvisible:    (*RogueGame).quaffSeeInvisible,
+			PotionHealing:         (*RogueGame).quaffHealing,
+			PotionDetectMonsters:  (*RogueGame).quaffDetectMonsters,
+			PotionDetectMagic:     (*RogueGame).quaffDetectMagic,
+			PotionRaiseLevel:      (*RogueGame).quaffRaiseLevel,
+			PotionExtraHealing:    (*RogueGame).quaffExtraHealing,
+			PotionHaste:           (*RogueGame).quaffHaste,
+			PotionRestoreStrength: (*RogueGame).quaffRestoreStrength,
+			PotionBlindness:       (*RogueGame).quaffBlindness,
+			PotionLevitation:      (*RogueGame).quaffLevitation,
+		},
 	}
 }