Add deploy preview skill

skills/deploy/preview.md

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+# Skill: Deploy Preview
+
+## Description
+Deploys a preview environment for a feature branch.
+
+## Input
+- **branch**: Branch name to deploy (required)
+- **project**: Project name (required)
+- **expire_hours**: Hours until auto-cleanup (optional, default: 24)
+
+## Steps
+1. Validate branch exists in Gitea
+2. Create preview deployment in Dokploy
+3. Configure preview subdomain
+4. Run deployment
+5. Return preview URL
+
+## Output Format
+```json
+{
+  "status": "success|error",
+  "preview": {
+    "url": "https://preview-branch-project.mylder.io",
+    "branch": "feature/my-feature",
+    "expires_at": "2024-12-12T12:00:00Z",
+    "deployment_id": "abc123"
+  },
+  "logs_url": "https://dokploy.mylder.io/deployments/abc123"
+}
+```
+
+## Token Budget
+- Max input: 300 tokens
+- Max output: 300 tokens
+
+## Model
+- Recommended: haiku (simple orchestration)