refactor: [notion] API 키를 DB(ai_configs)에서 .env로 전환

- NotionService: AiConfig::getActiveNotion() → config('services.notion')
- config/services.php에 notion 섹션 추가
- .env에 NOTION_API_KEY, NOTION_VERSION 추가

app/Services/NotionService.php

@@ -17,14 +17,14 @@ class NotionService
 
     public function __construct()
     {
-        $config = AiConfig::getActiveNotion();
-        if (! $config) {
-            throw new \RuntimeException('Notion API 설정이 없거나 비활성화 상태입니다.');
+        $apiKey = config('services.notion.api_key');
+        if (! $apiKey) {
+            throw new \RuntimeException('Notion API 키가 설정되지 않았습니다. .env 파일의 NOTION_API_KEY를 확인하세요.');
         }
 
-        $this->apiKey = $config->api_key;
-        $this->version = $config->model ?: '2025-09-03';
-        $this->baseUrl = $config->base_url ?: 'https://api.notion.com/v1';
+        $this->apiKey = $apiKey;
+        $this->version = config('services.notion.version', '2025-09-03');
+        $this->baseUrl = config('services.notion.base_url', 'https://api.notion.com/v1');
     }
 
     /**

config/services.php

@@ -44,6 +44,12 @@
         'api_key' => env('CLAUDE_API_KEY'),
     ],
 
+    'notion' => [
+        'api_key' => env('NOTION_API_KEY'),
+        'version' => env('NOTION_VERSION', '2025-09-03'),
+        'base_url' => env('NOTION_BASE_URL', 'https://api.notion.com/v1'),
+    ],
+
     'google' => [
         'credentials_path' => env('GOOGLE_APPLICATION_CREDENTIALS'),
         'storage_bucket' => env('GOOGLE_STORAGE_BUCKET'),