init：创建后端项目框架，确保环境的基本运行

tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "CommonJS",
+    "lib": ["ES2020"],
+    "moduleResolution": "node",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true,
+    "strictNullChecks": false
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}