feat: apply relic passive effects (ATK/DEF boost, heal on kill, gold boost)

entity/player.go

@@ -82,6 +82,11 @@ func (p *Player) EffectiveATK() int {
 			atk += item.Bonus
 		}
 	}
+	for _, r := range p.Relics {
+		if r.Effect == RelicATKBoost {
+			atk += r.Value
+		}
+	}
 	return atk
 }
 
@@ -92,5 +97,10 @@ func (p *Player) EffectiveDEF() int {
 			def += item.Bonus
 		}
 	}
+	for _, r := range p.Relics {
+		if r.Effect == RelicDEFBoost {
+			def += r.Value
+		}
+	}
 	return def
 }