Restructure Project Architecture with Modular Routes and Configuration

- Refactored main application entry point to use centralized configuration
- Created modular route structure with separate files for different API endpoints
- Introduced app.config.ts for centralized environment variable management
- Moved tools and route logic into dedicated files
- Simplified index.ts and improved overall project organization
- Added comprehensive type definitions for tools and API interactions

src/routes/index.ts

@@ -0,0 +1,39 @@
+/**
+ * API Routes Module
+ * 
+ * This module exports the main router that combines all API routes
+ * into a single router instance. Each route group is mounted under
+ * its respective path prefix.
+ * 
+ * @module routes
+ */
+
+import { Router } from 'express';
+import { mcpRoutes } from './mcp.routes';
+import { sseRoutes } from './sse.routes';
+import { toolRoutes } from './tool.routes';
+import { healthRoutes } from './health.routes';
+
+/**
+ * Create main router instance
+ * This router will be mounted at /api in the main application
+ */
+const router = Router();
+
+/**
+ * Mount all route groups
+ * - /mcp: MCP schema and execution endpoints
+ * - /sse: Server-Sent Events endpoints
+ * - /tools: Tool management endpoints
+ * - /health: Health check endpoint
+ */
+router.use('/mcp', mcpRoutes);
+router.use('/sse', sseRoutes);
+router.use('/tools', toolRoutes);
+router.use('/health', healthRoutes);
+
+/**
+ * Export the configured router
+ * This will be mounted in the main application
+ */
+export { router as apiRoutes };