初始化仓库及v1.0.0提交

app/Models/Message.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Models;
+
+use App\Config\Database;
+
+class Message
+{
+    public static function findBySessionId(int $sessionId): array
+    {
+        $db = Database::getInstance();
+        $stmt = $db->prepare('SELECT * FROM messages WHERE session_id = :session_id ORDER BY created_at ASC');
+        $stmt->execute(['session_id' => $sessionId]);
+        return $stmt->fetchAll();
+    }
+
+    public static function create(array $data): array
+    {
+        $db = Database::getInstance();
+        $stmt = $db->prepare('INSERT INTO messages (session_id, role, content, file_info, thinking_content) VALUES (:session_id, :role, :content, :file_info, :thinking_content)');
+        $stmt->execute([
+            'session_id' => $data['session_id'],
+            'role' => $data['role'],
+            'content' => $data['content'],
+            'file_info' => isset($data['file_info']) ? json_encode($data['file_info']) : null,
+            'thinking_content' => $data['thinking_content'] ?? null,
+        ]);
+
+        $stmt = $db->prepare('SELECT * FROM messages WHERE id = :id');
+        $stmt->execute(['id' => (int) $db->lastInsertId()]);
+        return $stmt->fetch();
+    }
+}