implemeted step 13 by Gemini

- added configuracion .env
- added test script for DAI API client

src/Services/DAIClient.php

@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use Exception;
+
+class DAIClient
+{
+	private string $apiUrl;
+	private int $timeout = 60;
+
+	public function __construct(?string $apiUrl = null)
+	{
+		if ($apiUrl !== null) {
+			$this->apiUrl = $apiUrl;
+		} else {
+			$this->apiUrl = \App\Utils\Config::get('DAIAPI_URL', 'http://192.168.122.10:9001/run');
+		}
+	}
+
+	/**
+	 * Sends a prompt to the DAIAPI and returns the raw answer string.
+	 */
+	public function sendRequest(string $prompt): ?string
+	{
+		$payload = json_encode([
+			'prompt' => $prompt
+		]);
+
+		if ($payload === false) {
+			error_log("DAIClient Error: Failed to encode JSON payload.");
+			return null;
+		}
+
+		$ch = curl_init($this->apiUrl);
+		curl_setopt_array($ch, [
+			CURLOPT_RETURNTRANSFER => true,
+			CURLOPT_POST => true,
+			CURLOPT_HTTPHEADER => [
+				'Content-Type: application/json',
+				'Content-Length: ' . strlen($payload)
+			],
+			CURLOPT_POSTFIELDS => $payload,
+			CURLOPT_TIMEOUT => $this->timeout,
+		]);
+
+		$response = curl_exec($ch);
+		$error = curl_error($ch);
+		$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+		curl_close($ch);
+
+		if ($response === false) {
+			error_log("DAIClient Error: cURL error: $error");
+			return null;
+		}
+
+		if ($httpCode !== 200) {
+			error_log("DAIClient Error: API returned HTTP code $httpCode. Response: $response");
+			return null;
+		}
+
+		$data = json_decode($response, true);
+		if (!is_array($data) || empty($data['success']) || !isset($data['answer'])) {
+			error_log("DAIClient Error: Invalid API response format: " . $response);
+			return null;
+		}
+
+		return $data['answer'];
+	}
+}