fix: resolve 7 circular dependency chains in src/lib/game

- equipment/utils.ts: import directly from individual equipment modules instead of index.ts
- golems/utils.ts: import directly from individual golem modules instead of index.ts
- combatStore.ts: extract CombatState to combat-state.types.ts, remove debugSetTime (was only user of gameStore import)
- combat-actions.ts: import CombatState from combat-state.types.ts instead of combatStore
- stores/index.ts: re-export CombatState from combat-state.types.ts
- GameStateDebug.tsx: replace debugSetTime calls with direct useGameStore.setState()

Verification: bunx madge --circular src/lib/game → No circular dependency found!

src/lib/game/data/equipment/utils.ts

@@ -1,7 +1,27 @@
 // ─── Equipment Helper Functions ─────────────────────────
 
 import type { EquipmentType, EquipmentSlot, EquipmentCategory } from './types';
-import { EQUIPMENT_TYPES } from './index';
+import { ACCESSORIES_EQUIPMENT } from './accessories';
+import { BODY_EQUIPMENT } from './body';
+import { CASTER_EQUIPMENT } from './casters';
+import { CATALYST_EQUIPMENT } from './catalysts';
+import { FEET_EQUIPMENT } from './feet';
+import { HANDS_EQUIPMENT } from './hands';
+import { HEAD_EQUIPMENT } from './head';
+import { SHIELD_EQUIPMENT } from './shields';
+import { SWORD_EQUIPMENT } from './swords';
+
+const EQUIPMENT_TYPES: Record<string, EquipmentType> = {
+  ...ACCESSORIES_EQUIPMENT,
+  ...BODY_EQUIPMENT,
+  ...CASTER_EQUIPMENT,
+  ...CATALYST_EQUIPMENT,
+  ...FEET_EQUIPMENT,
+  ...HANDS_EQUIPMENT,
+  ...HEAD_EQUIPMENT,
+  ...SHIELD_EQUIPMENT,
+  ...SWORD_EQUIPMENT,
+};
 
 export function getEquipmentType(id: string): EquipmentType | undefined {
   return EQUIPMENT_TYPES[id];