feat: sap-cli skill v2.1.0 — self-contained distributable package

- assets/: sap-cli source (v2.1.0, 26 commands, 16 object types)
- references/: tool constraints + error handling (self-contained)
- scripts/setup.py: one-click install/config/verify
- SKILL.md: full command reference + dual-platform install guide
- VERSION: 2.1.0

Built from D:/Codespace/sap-cli via scripts/pack_skill.py

assets/sapcli/utils/__init__.py

@@ -0,0 +1,5 @@
+"""sapcli 工具包"""
+
+from .xml_utils import xml_escape, ddl_escape
+
+__all__ = ["xml_escape", "ddl_escape"]