Add core classes and tests for Groq AI compatibility, logging, and model services

- Implement Groq_AI_Compatibility_Service to manage WooCommerce dependency and admin notices.
- Create Groq_AI_Log_Scheduler for scheduled log cleanup based on settings.
- Develop Groq_AI_Model_Service for model selection and caching.
- Add language translations in POT file for Dutch.
- Set up PHPUnit configuration and bootstrap for testing.
- Implement unit tests for model exclusions, provider request building, settings management, and term saving functionality.

tests/ProviderRequestBuilderTest.php

@@ -0,0 +1,102 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+
+class ProviderRequestBuilderTest extends TestCase {
+	public function test_openai_request_payload_respects_settings() {
+		$provider = new Groq_AI_Provider_OpenAI();
+		$result = $provider->generate_content(
+			[
+				'prompt' => 'Hallo',
+				'system_prompt' => 'System',
+				'model' => 'gpt-4o-mini',
+				'settings' => [
+					'openai_api_key' => 'test-key',
+					'max_output_tokens' => 512,
+				],
+				'temperature' => 0.5,
+				'response_format' => [
+					'type' => 'json_object',
+				],
+			]
+		);
+
+		$this->assertIsArray( $result );
+		$payload = $result['request_payload']['body'];
+		$this->assertSame( 'gpt-4o-mini', $payload['model'] );
+		$this->assertSame( 0.5, $payload['temperature'] );
+		$this->assertSame( 512, $payload['max_tokens'] );
+		$this->assertSame( 'json_object', $payload['response_format']['type'] );
+		$this->assertSame( 'System', $payload['messages'][0]['content'] );
+		$this->assertSame( 'Hallo', $payload['messages'][1]['content'] );
+	}
+
+	public function test_groq_request_payload_uses_default_model_when_missing() {
+		$provider = new Groq_AI_Provider_Groq();
+		$result = $provider->generate_content(
+			[
+				'prompt' => 'Hallo',
+				'system_prompt' => 'System',
+				'settings' => [
+					'groq_api_key' => 'test-key',
+				],
+			]
+		);
+
+		$this->assertIsArray( $result );
+		$payload = $result['request_payload']['body'];
+		$this->assertSame( $provider->get_default_model(), $payload['model'] );
+		$this->assertSame( 'System', $payload['messages'][0]['content'] );
+		$this->assertSame( 'Hallo', $payload['messages'][1]['content'] );
+	}
+
+	public function test_google_request_payload_builds_schema_and_images() {
+		$provider = new Groq_AI_Provider_Google();
+		$result = $provider->generate_content(
+			[
+				'prompt' => 'Hallo',
+				'system_prompt' => 'System',
+				'model' => 'gemini-1.5-flash',
+				'settings' => [
+					'google_api_key' => 'test-key',
+					'max_output_tokens' => 256,
+					'google_safety_settings' => [
+						'HARM_CATEGORY_HARASSMENT' => 'BLOCK_LOW_AND_ABOVE',
+					],
+				],
+				'temperature' => 0.2,
+				'response_format' => [
+					'type' => 'json_schema',
+					'json_schema' => [
+						'schema' => [
+							'type' => 'object',
+							'properties' => [
+								'name' => [
+									'type' => 'string',
+								],
+							],
+						],
+					],
+				],
+				'image_context' => [
+					[
+						'label' => 'Image 1',
+						'mime_type' => 'image/png',
+						'data' => 'BASE64DATA',
+					],
+				],
+			]
+		);
+
+		$this->assertIsArray( $result );
+		$payload = $result['request_payload']['body'];
+		$this->assertSame( 0.2, $payload['generationConfig']['temperature'] );
+		$this->assertSame( 256, $payload['generationConfig']['maxOutputTokens'] );
+		$this->assertSame( 'application/json', $payload['generationConfig']['responseMimeType'] );
+		$this->assertArrayHasKey( 'responseJsonSchema', $payload['generationConfig'] );
+		$this->assertSame( 'System', $payload['contents'][0]['parts'][0]['text'] );
+		$this->assertSame( 'Hallo', $payload['contents'][0]['parts'][1]['text'] );
+		$this->assertSame( 'image/png', $payload['contents'][0]['parts'][3]['inline_data']['mime_type'] );
+		$this->assertSame( 'BASE64DATA', $payload['contents'][0]['parts'][3]['inline_data']['data'] );
+	}
+}