feat: game pause/speed control API with AI pause protocol

- POST /api/action/pause - pause game (AI must call before operations)
- POST /api/action/unpause - resume game at desired speed
- POST /api/action/speed - set game speed (1x/2x/3x)
- Game state now includes isPaused and gameSpeed
- AI pause protocol documented in SKILL.md: pause before every operation
- Introduces cell.isDiggable flag that filters neutronium properly
- pause/unpause/speed CLI commands added to oni_api.py

README.md

@@ -100,6 +100,11 @@ python3 tools/oni_api.py research_select ImprovedOxygen  # 科研
 python3 tools/oni_api.py mop 10 10               # 清理液体
 python3 tools/oni_api.py harvest 20 15           # 收获植物
 
+# 游戏速度控制（AI 操作前必须先暂停）
+python3 tools/oni_api.py pause "Reason here"    # 暂停游戏
+python3 tools/oni_api.py unpause 1              # 恢复（1x 速度）
+python3 tools/oni_api.py speed 3                # 直接设速度（不暂停）
+
 # 批量任务
 python3 tools/oni_api.py batch docs/batch_example.json  # 执行批量建造计划
 
@@ -231,6 +236,9 @@ python3 scripts/event_daemon.py      # 事件守护进程（AI 输入源）
 | `/api/action/batch` | `{actions: [{type, ...}]}` — 批量执行 |
 | `/api/action/priority_global` | `{target, priority}` — 全局默认优先级 |
 | `/api/action/priority_type` | `{buildingType, priority}` — 按建筑类型设优先级 |
+| `/api/action/pause` | `{reason?}` — 暂停游戏（AI 操作前必须调用） |
+| `/api/action/unpause` | `{speed?}` — 恢复游戏 |
+| `/api/action/speed` | `{speed}` — 设置速度 1x/2x/3x |
 
 ## 项目结构