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/combat-actions.ts

@@ -2,7 +2,7 @@
 // Extracted combat logic from combatStore.ts
 
 import { SPELLS_DEF, GUARDIANS, HOURS_PER_TICK } from '../constants';
-import type { CombatState } from './combatStore';
+import type { CombatState } from './combat-state.types';
 import type { SpellState } from '../types';
 import { getFloorMaxHP, getFloorElement, calcDamage, canAffordSpellCost, deductSpellCost } from '../utils';
 import { usePrestigeStore } from './prestigeStore';