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/stores/index.ts

@@ -12,7 +12,7 @@ export { useManaStore, makeInitialElements } from './manaStore';
 export type { ManaState } from './manaStore';
 
 export { useCombatStore, makeInitialSpells } from './combatStore';
-export type { CombatState } from './combatStore';
+export type { CombatState } from './combat-state.types';
 
 export { useCraftingStore } from './craftingStore';
 export type { CraftingState, CraftingActions } from './craftingStore';