feat: 奇门遁甲排盘算法层 v1.0

- qimen-data.ts: 九宫/八门/九星/八神/三奇六仪/五行生克
- plate.ts: 时家奇门排盘（阴阳遁/局数/天地盘/八门/九星/八神/空亡/驿马）
- run-qimen.ts: CLI入口（九宫格式化输出）
- duangua-prompt.md: 断局分析提示词
- SKILL.md: 完整文档

calculator/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "qimen-calculator",
+  "version": "1.0.0",
+  "description": "奇门遁甲排盘算法层",
+  "type": "module",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/run-qimen.js"
+  },
+  "devDependencies": {
+    "typescript": "^5.3.0",
+    "@types/node": "^22.0.0"
+  }
+}