fix: ingest_obsidian 移除硬编码回退路径，改为明确错误提示

scripts/ingest_obsidian.py

@@ -49,12 +49,9 @@ else:
         dirs = [d.strip() for d in env_dirs.split(",") if d.strip()]
         targets = [(Path(d).name, d) for d in dirs]
     else:
-        # 回退默认路径 (仅在本机可用)
-        targets = [
-            ("博客", "D:/Code/Obsidian/博客"),
-            ("Club", "D:/Code/Obsidian/Club-Service-Guide"),
-            ("halo", "D:/Code/Obsidian/obsidian-halo"),
-        ]
+        log("错误: 未指定目标目录。请通过命令行参数或 OBSIDIAN_DIRS 环境变量提供。")
+        log("用法: uv run python scripts/ingest_obsidian.py <目录1> [目录2] ...")
+        sys.exit(1)
 files = []
 skipped = []
 for label, d in targets: