refactor: Convert monolithic app to modular architecture

This commit refactors the entire codebase from a monolithic structure to a
modular one. Key changes include:

-   Extracting core components (e.g., user authentication, data processing,
    API handlers) into their own distinct modules.
-   Implementing a new directory structure to support a modular design.
-   Updating all internal references and import paths to reflect the new
    architecture.

The new structure improves maintainability, scalability, and allows for
easier independent development of each module in the future.

middleware/securityMw.js

@@ -0,0 +1,45 @@
+const fetch = require('node-fetch');
+
+module.exports = {
+    formSecurityCheck: async (req, res, next) => {
+        // 1. Honeypot check (first line of defense)
+        if (req.body.url) {
+            console.warn('Bot detected! Honeypot field was filled.');
+            return res.status(200).json({ success: true, message: 'Thank you for your submission.' });
+        }
+        
+        // 2. hCaptcha verification (second line of defense)
+        const hCaptchaResponse = req.body.hCaptchaResponse;
+        if (!hCaptchaResponse) {
+            return res.status(400).json({ success: false, message: 'CAPTCHA token missing.' });
+        }
+        
+        try {
+            const secretKey = process.env.HCAPTCHA_SECRET;
+            const verificationUrl = 'https://hcaptcha.com/siteverify';
+            
+            const verificationResponse = await fetch(verificationUrl, {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+                body: new URLSearchParams({
+                    secret: secretKey,
+                    response: hCaptchaResponse
+                })
+            });
+            
+            const verificationData = await verificationResponse.json();
+            
+            if (!verificationData.success) {
+                console.error('hCaptcha verification failed:', verificationData['error-codes']);
+                return res.status(400).json({ success: false, message: 'CAPTCHA verification failed. Please try again.' });
+            }
+            
+            // If all checks pass, move to the next middleware or controller
+            next();
+            
+        } catch (error) {
+            console.error('An error occurred during hCaptcha verification:', error);
+            return res.status(500).json({ success: false, message: 'Internal server error during CAPTCHA verification.' });
+        }
+    }
+};