feat: [additional] Notion 검색 기능 추가

- NotionService: Notion API 검색 + Gemini AI 답변
- AiConfig에 notion provider 추가
- 추가기능 > Notion 검색 채팅 UI

app/Models/System/AiConfig.php

@@ -52,6 +52,7 @@ class AiConfig extends Model
         'claude' => 'https://api.anthropic.com/v1',
         'openai' => 'https://api.openai.com/v1',
         'gcs' => 'https://storage.googleapis.com',
+        'notion' => 'https://api.notion.com/v1',
     ];
 
     /**
@@ -62,12 +63,13 @@ class AiConfig extends Model
         'claude' => 'claude-sonnet-4-20250514',
         'openai' => 'gpt-4o',
         'gcs' => '-',
+        'notion' => '2025-09-03',
     ];
 
     /**
      * AI Provider 목록 (GCS 제외)
      */
-    public const AI_PROVIDERS = ['gemini', 'claude', 'openai'];
+    public const AI_PROVIDERS = ['gemini', 'claude', 'openai', 'notion'];
 
     /**
      * 스토리지 Provider 목록
@@ -94,6 +96,16 @@ public static function getActiveClaude(): ?self
             ->first();
     }
 
+    /**
+     * 활성화된 Notion 설정 조회
+     */
+    public static function getActiveNotion(): ?self
+    {
+        return self::where('provider', 'notion')
+            ->where('is_active', true)
+            ->first();
+    }
+
     /**
      * Provider별 활성 설정 조회
      */
@@ -122,6 +134,7 @@ public function getProviderLabelAttribute(): string
             'claude' => 'Anthropic Claude',
             'openai' => 'OpenAI',
             'gcs' => 'Google Cloud Storage',
+            'notion' => 'Notion',
             default => $this->provider,
         };
     }
@@ -193,7 +206,7 @@ public function getMaskedApiKeyAttribute(): string
             return $this->api_key;
         }
 
-        return substr($this->api_key, 0, 8) . str_repeat('*', 8) . '...';
+        return substr($this->api_key, 0, 8).str_repeat('*', 8).'...';
     }
 
     /**
@@ -236,6 +249,7 @@ public function getAuthTypeLabelAttribute(): string
         if ($this->isVertexAi()) {
             return 'Vertex AI (서비스 계정)';
         }
+
         return 'API 키';
     }
 }