feat: add xui-deploy skill with lessons learned

- SKILL.md v1.1: full deployment workflow for 3x-ui on VPS via SSH
- Covers Docker/native install, Nginx+TLS, Xray inbound config
- references/xray-inbound-config.md: VLESS+WS+TLS and Reality configs
- references/lessons-learned.md: lessons from first real deployment
  - /app/x-ui binary vs shell wrapper in Docker
  - correct API path: panel/api/inbounds/add
  - subPath-only DB write (subURI causes blank settings page)
  - --network host port exposure workaround
- Agent prompt and eval configs included

.kiro/agents/xui-deploy.json

@@ -0,0 +1,11 @@
+{
+  "name": "xui-deploy",
+  "description": "Automates installing and configuring x-ui (3x-ui Xray panel) on a VPS via SSH. Use when you want to deploy x-ui, install 3x-ui, set up an Xray proxy panel, or configure inbound proxies on a VPS.",
+  "prompt": "file://prompts/xui-deploy.md",
+  "tools": ["execute_bash", "fs_read"],
+  "allowedTools": ["fs_read"],
+  "resources": [
+    "skill://skills/xui-deploy/SKILL.md"
+  ],
+  "welcomeMessage": "Ready to deploy x-ui on your VPS. Tell me your VPS host, SSH user, and panel password to get started."
+}