Add Google and Groq AI providers, enhance provider manager, and implement conversation and logging services

- Introduced `Groq_AI_Provider_Google` and `Groq_AI_Provider_Groq` classes for handling AI interactions with Google and Groq respectively.
- Enhanced `Groq_AI_Provider_Manager` to register and manage multiple AI providers.
- Implemented `Groq_AI_Conversation_Manager` for managing conversation IDs and context hashes.
- Added `Groq_AI_Generation_Logger` for logging AI generation events and managing log tables.
- Developed `Groq_AI_Prompt_Builder` for constructing prompts and processing AI responses.
- Established `Groq_AI_Settings_Manager` for managing plugin settings, including context fields and module configurations.

includes/Services/Conversations/class-groq-ai-conversation-manager.php

@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * Beheert conversatie-ID's per provider + context-hash.
+ *
+ * Verplaatst vanuit groq-ai-product-text.php:
+ * - ensure_conversation_id()
+ * - get/save_conversation_states()
+ * - get_context_hash()
+ */
+class Groq_AI_Conversation_Manager {
+	/** @var string */
+	private $option_key;
+
+	public function __construct( $option_key ) {
+		$this->option_key = $option_key;
+	}
+
+	/**
+	 * Retourneert of creëert een conversatie-ID.
+	 *
+	 * @param string $provider_key
+	 * @param string $store_context
+	 * @return string
+	 */
+	public function ensure_id( $provider_key, $store_context ) {
+		$states       = $this->get_states();
+		$context_hash = $this->get_context_hash( $store_context );
+
+		if ( isset( $states[ $provider_key ]['hash'], $states[ $provider_key ]['id'] ) && $states[ $provider_key ]['hash'] === $context_hash ) {
+			return $states[ $provider_key ]['id'];
+		}
+
+		$conversation_id         = wp_generate_uuid4();
+		$states[ $provider_key ] = [
+			'hash' => $context_hash,
+			'id'   => $conversation_id,
+		];
+		$this->save_states( $states );
+
+		return $conversation_id;
+	}
+
+	/**
+	 * @return array
+	 */
+	private function get_states() {
+		$states = get_option( $this->option_key, [] );
+
+		return is_array( $states ) ? $states : [];
+	}
+
+	/**
+	 * @param array $states
+	 * @return void
+	 */
+	private function save_states( $states ) {
+		update_option( $this->option_key, $states, false );
+	}
+
+	/**
+	 * @param string $store_context
+	 * @return string
+	 */
+	private function get_context_hash( $store_context ) {
+		return md5( wp_json_encode( trim( (string) $store_context ) ) );
+	}
+}