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/config/app.config.ts

@@ -0,0 +1,67 @@
+import { config } from 'dotenv';
+import { resolve } from 'path';
+
+/**
+ * Load environment variables based on NODE_ENV
+ * Development: .env.development
+ * Test: .env.test
+ * Production: .env
+ */
+const envFile = process.env.NODE_ENV === 'production'
+    ? '.env'
+    : process.env.NODE_ENV === 'test'
+        ? '.env.test'
+        : '.env.development';
+
+console.log(`Loading environment from ${envFile}`);
+config({ path: resolve(process.cwd(), envFile) });
+
+/**
+ * Application configuration object
+ * Contains all configuration settings for the application
+ */
+export const APP_CONFIG = {
+    /** Server Configuration */
+    PORT: process.env.PORT || 3000,
+    NODE_ENV: process.env.NODE_ENV || 'development',
+
+    /** Home Assistant Configuration */
+    HASS_HOST: process.env.HASS_HOST || 'http://192.168.178.63:8123',
+    HASS_TOKEN: process.env.HASS_TOKEN,
+
+    /** Security Configuration */
+    JWT_SECRET: process.env.JWT_SECRET || 'your-secret-key',
+    RATE_LIMIT: {
+        /** Time window for rate limiting in milliseconds */
+        windowMs: 15 * 60 * 1000, // 15 minutes
+        /** Maximum number of requests per window */
+        max: 100 // limit each IP to 100 requests per windowMs
+    },
+
+    /** Server-Sent Events Configuration */
+    SSE: {
+        /** Maximum number of concurrent SSE clients */
+        MAX_CLIENTS: 1000,
+        /** Ping interval in milliseconds to keep connections alive */
+        PING_INTERVAL: 30000 // 30 seconds
+    },
+
+    /** Application Version */
+    VERSION: '0.1.0'
+} as const;
+
+/** Type definition for the configuration object */
+export type AppConfig = typeof APP_CONFIG;
+
+/** Required environment variables that must be set */
+const requiredEnvVars = ['HASS_TOKEN'] as const;
+
+/**
+ * Validate that all required environment variables are set
+ * Throws an error if any required variable is missing
+ */
+for (const envVar of requiredEnvVars) {
+    if (!process.env[envVar]) {
+        throw new Error(`Missing required environment variable: ${envVar}`);
+    }
+}