feat: improved the Claude Kit as a plugin

skills/init/templates/rules/security.md

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+# Security Rules
+
+- Never hardcode secrets, API keys, or credentials in source code
+- Use parameterized queries only — never string concatenation for SQL
+- No `eval()`, `new Function()`, or dynamic code execution
+- No `any` types in TypeScript — use proper typing
+- Validate all user inputs at API boundaries
+- Output encoding for all rendered content
+- Secrets via environment variables only
+- No disabled security headers
+- Authentication required on all protected endpoints
+- Rate limiting on public APIs