test: add comprehensive test suite for security and SSE components

- Implemented detailed Jest test configurations for project
- Added test configuration with robust environment setup
- Created comprehensive test suites for:
  * Security middleware
  * Token management
  * SSE security features
- Configured test utilities with mock request/response objects
- Implemented extensive test scenarios covering authentication, rate limiting, and error handling

jest.config.ts

@@ -0,0 +1,76 @@
+import type { Config } from '@jest/types';
+
+const config: Config.InitialOptions = {
+    preset: 'ts-jest',
+    testEnvironment: 'node',
+    roots: ['<rootDir>/src'],
+    testMatch: [
+        '**/__tests__/**/*.+(ts|tsx|js)',
+        '**/?(*.)+(spec|test).+(ts|tsx|js)'
+    ],
+    transform: {
+        '^.+\\.(ts|tsx)$': 'ts-jest'
+    },
+    moduleNameMapper: {
+        '^@/(.*)$': '<rootDir>/src/$1'
+    },
+    setupFilesAfterEnv: [
+        '<rootDir>/src/__tests__/setup.ts'
+    ],
+    globals: {
+        'ts-jest': {
+            tsconfig: 'tsconfig.json',
+            isolatedModules: true
+        }
+    },
+    collectCoverage: true,
+    collectCoverageFrom: [
+        'src/**/*.{ts,tsx}',
+        '!src/**/*.d.ts',
+        '!src/**/__tests__/**',
+        '!src/**/__mocks__/**',
+        '!src/**/types/**'
+    ],
+    coverageReporters: ['text', 'lcov', 'html'],
+    coverageDirectory: 'coverage',
+    coverageThreshold: {
+        global: {
+            branches: 80,
+            functions: 80,
+            lines: 80,
+            statements: 80
+        }
+    },
+    verbose: true,
+    testTimeout: 10000,
+    maxWorkers: '50%',
+    errorOnDeprecated: true,
+    clearMocks: true,
+    resetMocks: true,
+    restoreMocks: true,
+    testPathIgnorePatterns: [
+        '/node_modules/',
+        '/dist/',
+        '/.cursor/'
+    ],
+    watchPathIgnorePatterns: [
+        '/node_modules/',
+        '/dist/',
+        '/.cursor/',
+        '/coverage/'
+    ],
+    modulePathIgnorePatterns: [
+        '/dist/',
+        '/.cursor/'
+    ],
+    moduleFileExtensions: [
+        'ts',
+        'tsx',
+        'js',
+        'jsx',
+        'json',
+        'node'
+    ]
+};
+
+export default config;