chore: Update configuration and dependencies for enhanced MCP server functionality

- Add RATE_LIMIT_MAX_AUTH_REQUESTS to .env.example for improved rate limiting
- Update bun.lock and package.json to include new dependencies: @anthropic-ai/sdk, express-rate-limit, and their type definitions
- Modify bunfig.toml for build settings and output configuration
- Refactor src/config.ts to incorporate rate limiting settings
- Implement security middleware for enhanced request validation and sanitization
- Introduce rate limiting middleware for API and authentication endpoints
- Add tests for configuration validation and rate limiting functionality

test/setup.ts

@@ -0,0 +1,33 @@
+import { beforeAll, afterAll } from 'bun:test';
+
+// Mock environment variables for testing
+const TEST_ENV = {
+    NODE_ENV: 'test',
+    PORT: '3000',
+    EXECUTION_TIMEOUT: '30000',
+    STREAMING_ENABLED: 'false',
+    USE_STDIO_TRANSPORT: 'false',
+    USE_HTTP_TRANSPORT: 'true',
+    DEBUG_MODE: 'false',
+    DEBUG_STDIO: 'false',
+    DEBUG_HTTP: 'false',
+    SILENT_STARTUP: 'false',
+    CORS_ORIGIN: '*',
+    RATE_LIMIT_MAX_REQUESTS: '100',
+    RATE_LIMIT_MAX_AUTH_REQUESTS: '5'
+};
+
+beforeAll(() => {
+    // Store original environment
+    process.env = {
+        ...process.env,
+        ...TEST_ENV
+    };
+});
+
+afterAll(() => {
+    // Clean up test environment
+    Object.keys(TEST_ENV).forEach(key => {
+        delete process.env[key];
+    });
+});