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/components/game/debug/GameStateDebug.tsx

@@ -31,7 +31,6 @@ export function GameStateDebug() {
   const resetGame = useGameStore((s) => s.resetGame);
   const debugSetFloor = useCombatStore((s) => s.debugSetFloor);
   const resetFloorHP = useCombatStore((s) => s.resetFloorHP);
-  const debugSetTime = useCombatStore((s) => s.debugSetTime);
 
   const handleReset = () => {
     if (confirmReset) {
@@ -187,13 +186,13 @@ export function GameStateDebug() {
               <Button size="sm" variant="outline" onClick={() => useGameStore.setState({ day: 1, hour: 0 })}>
                 Day 1
               </Button>
-              <Button size="sm" variant="outline" onClick={() => debugSetTime?.(10, 0)}>
+              <Button size="sm" variant="outline" onClick={() => useGameStore.setState({ day: 10, hour: 0 })}>
                 Day 10
               </Button>
-              <Button size="sm" variant="outline" onClick={() => debugSetTime?.(20, 0)}>
+              <Button size="sm" variant="outline" onClick={() => useGameStore.setState({ day: 20, hour: 0 })}>
                 Day 20
               </Button>
-              <Button size="sm" variant="outline" onClick={() => debugSetTime?.(30, 0)}>
+              <Button size="sm" variant="outline" onClick={() => useGameStore.setState({ day: 30, hour: 0 })}>
                 Day 30
               </Button>
             </div>