chore: Remove obsolete .classpath file

- Deleted the .classpath file as it is no longer needed in the project structure.
- This cleanup helps maintain a tidy codebase by removing unnecessary files that may cause confusion or clutter.

backend-node/jest.config.js

@@ -0,0 +1,17 @@
+module.exports = {
+  preset: "ts-jest",
+  testEnvironment: "node",
+  roots: ["<rootDir>/src"],
+  testMatch: ["**/__tests__/**/*.ts", "**/?(*.)+(spec|test).ts"],
+  transform: {
+    "^.+\\.ts$": "ts-jest",
+  },
+  collectCoverageFrom: ["src/**/*.ts", "!src/**/*.d.ts", "!src/tests/**"],
+  coverageDirectory: "coverage",
+  coverageReporters: ["text", "lcov", "html"],
+  setupFilesAfterEnv: ["<rootDir>/src/tests/setup.ts"],
+  testTimeout: 30000,
+  verbose: true,
+  // 환경 변수 설정
+  setupFiles: ["<rootDir>/src/tests/env.setup.ts"],
+};