feat(core): 启用 TypeScript 最严格的类型检查 (#199)

* feat(core):  启用 TypeScript 最严格的类型检查

* ci: 配置 Codecov 以适应类型安全改进

* fix(core): 修复 CodeQL 安全警告

* fix(core): eslint.config.mjs

packages/core/tsconfig.test.json

@@ -0,0 +1,18 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noImplicitReturns": false,
+    "noUncheckedIndexedAccess": false,
+    "noPropertyAccessFromIndexSignature": false
+  },
+  "include": [
+    "tests/**/*",
+    "src/**/*"
+  ],
+  "exclude": [
+    "node_modules",
+    "bin"
+  ]
+}