Initial commit: Text Adventure Game

Features:
- Combat system with AP/EP hit calculation and three-layer defense
- Auto-combat/farming mode
- Item system with stacking support
- Skill system with levels, milestones, and parent skill sync
- Shop system with dynamic pricing
- Inventory management with bulk selling
- Event system
- Game loop with offline earnings
- Save/Load system

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/agents/backend-unit-testing.md

@@ -0,0 +1,6 @@
+---
+name: backend-unit-testing
+description: 对后端模块执行单元测试
+model: sonnet
+---
+在所有定义的模块上执行单元测试。验证每个模块通过所有测试且逻辑符合预期行为。