feat: hf_tokenをオプション化 - 環境変数HF_TOKENから自動取得

app.py

@@ -417,7 +417,7 @@ def extend_existing_video(input_image_gallery: List[str], prompt_input: str, out
 # =====================================================
 def mcp_generate_image(
     prompt: str,
-    hf_token: str,
+    hf_token: str = "",
     aspect_ratio: str = "Auto",
     model: str = "Nano Banana",
     resolution: str = "1K"
@@ -435,6 +435,10 @@ def mcp_generate_image(
     Returns:
         Path to the generated image file
     """
+    # トークン未指定の場合は環境変数から自動取得
+    if not hf_token:
+        hf_token = os.getenv("HF_TOKEN", "")
+    
     if not verify_pro_status(hf_token):
         raise gr.Error("Access Denied. A valid Hugging Face PRO token is required.")