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
 }

entity/player_test.go

@@ -37,6 +37,18 @@ func TestAllClasses(t *testing.T) {
 	}
 }
 
+func TestRelicEffects(t *testing.T) {
+	p := NewPlayer("test", ClassWarrior)
+	p.Relics = append(p.Relics, Relic{Name: "Power Amulet", Effect: RelicATKBoost, Value: 3})
+	if p.EffectiveATK() != 15 {
+		t.Errorf("ATK with relic: got %d, want 15", p.EffectiveATK())
+	}
+	p.Relics = append(p.Relics, Relic{Name: "Iron Ward", Effect: RelicDEFBoost, Value: 2})
+	if p.EffectiveDEF() != 10 {
+		t.Errorf("DEF with relic: got %d, want 10", p.EffectiveDEF())
+	}
+}
+
 func TestPlayerTakeDamage(t *testing.T) {
 	p := NewPlayer("test", ClassWarrior)
 	p.TakeDamage(30)