docs: add security policy and deployment guide

- Add SECURITY.md with vulnerability reporting process
- Add comprehensive deployment guide (docs/deployment/index.md)
- Generate uv.lock for reproducible builds
- Update audit rules to check correct deployment path
- Remove Node.js dependency, use Tailwind CLI standalone

Resolves audit warnings:
- THIRD-DEP-001: Dependency lock file
- DOC-SEC-001: Security policy
- DOC-OPS-001: Deployment documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.audit-rules/documentation.yaml

@@ -130,7 +130,7 @@ rules:
     check:
       type: file_exists
       paths:
-        - "docs/guides/deployment.md"
+        - "docs/deployment/index.md"
         - "docs/**/deploy*.md"
       message: "Deployment documentation required"