feat: 添加場景識別 Playground API 整合

新增:
- scripts/test_scene_api.py - API 測試腳本
- docs_v1.0/IMPLEMENTATION/SCENE_API_INTEGRATION.md - API 整合指南

功能:
- ✅ GET /api/v1/scene/:uuid endpoint 設計
- ✅ Python 測試腳本
- ✅ 完整使用文檔
- ✅ Python 整合範例

使用方式:
```bash
# 啟動 Playground (port 3003)
cargo run --bin momentry_playground -- server --port 3003

# 測試場景識別
python3 scripts/test_scene_api.py <video_uuid>
```

目前狀態:
- ✅ Python 場景識別功能正常
- ✅ API endpoint 設計完成
- ⏳ Rust 完整實作進行中
- 📄 完整文檔已建立

scripts/test_scene_api.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+"""測試場景識別 API"""
+
+import requests
+import json
+import sys
+
+API_KEY = "muser_68600856036340bcafc01930eb4bd839_1774418104_97221b69"
+BASE_URL = "http://localhost:3003"
+
+def test_scene_classification(video_uuid: str):
+    """測試場景識別 API"""
+    print(f"測試場景識別 API: {video_uuid}")
+    print(f"API URL: {BASE_URL}/api/v1/scene/{video_uuid}")
+    
+    headers = {
+        "X-API-Key": API_KEY
+    }
+    
+    try:
+        response = requests.get(
+            f"{BASE_URL}/api/v1/scene/{video_uuid}",
+            headers=headers,
+            timeout=300
+        )
+        
+        print(f"\nHTTP 狀態碼：{response.status_code}")
+        
+        if response.status_code == 200:
+            result = response.json()
+            print(f"\n✓ 場景識別成功")
+            print(f"處理時間：{result.get('processing_time', 0):.2f} 秒")
+            print(f"場景數量：{len(result.get('scenes', []))}")
+            
+            if result.get('scenes'):
+                print(f"\n場景詳情:")
+                for i, scene in enumerate(result['scenes'][:3]):
+                    print(f"  {i+1}. {scene.get('scene_type')} ({scene.get('confidence', 0)*100:.1f}%)")
+                    print(f"     時間：{scene.get('start_time', 0):.1f}s - {scene.get('end_time', 0):.1f}s")
+            
+            return True
+        else:
+            print(f"\n✗ API 請求失敗：{response.status_code}")
+            print(f"回應：{response.text[:200]}")
+            return False
+            
+    except requests.exceptions.RequestException as e:
+        print(f"\n✗ 請求錯誤：{e}")
+        print("\n請確認:")
+        print("1. Playground 伺服器已啟動 (port 3003)")
+        print("2. API key 正確")
+        print("3. 影片 UUID 存在")
+        return False
+
+def main():
+    if len(sys.argv) < 2:
+        print("使用方式：python3 scripts/test_scene_api.py <video_uuid>")
+        print("\n範例:")
+        print("  python3 scripts/test_scene_api.py 384b0ff44aaaa1f1")
+        sys.exit(1)
+    
+    video_uuid = sys.argv[1]
+    success = test_scene_classification(video_uuid)
+    sys.exit(0 if success else 1)
+
+if __name__ == "__main__":
+    main()