feat: U-Claw v1.0 - OpenClaw offline installer USB for China

- Build script to package Node.js (Mac ARM64/x64 + Win x64) + OpenClaw + all deps
- YuLinMuFeng-style launcher menu with 16 functions (install/repair/backup/reset)
- 8 Chinese AI models one-click config (DeepSeek/Kimi/Qwen/GLM/MiniMax/Doubao/Qianfan/Mimo)
- QQ official integration (Tencent), Feishu, WeChat, Telegram, Discord, WhatsApp, Slack
- 52 pre-installed skills, all offline
- Bilingual README (Chinese + English)
- Full China tutorial (12 chapters)
- MIT license

.gitignore

@@ -0,0 +1,20 @@
+# U-Claw build outputs (too large for git)
+U-Claw/runtime/
+U-Claw/openclaw/node_modules/
+U-Claw/openclaw/dist/
+U-Claw/openclaw/.git/
+U-Claw/backups/
+
+# OpenClaw source (users download separately)
+openclaw-2026.3.7/
+openclaw-2026.3.7.zip
+
+# Build cache
+.download-cache/
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Claude
+.claude/