docs(showcase): add public qlockify showcase + screenshots

docs/security-and-privacy.md

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+# Security and Privacy
+
+## Source Code Privacy
+
+Qlockify source code is private. This showcase repository is documentation-only and does not contain backend, frontend, deployment, or infrastructure source.
+
+## Demo Safety
+
+The public demo uses isolated temporary data. Demo users should not enter real customer data, private notes, credentials, or sensitive business information.
+
+## Public Repository Rules
+
+Do not commit:
+
+- `.env` files
+- credentials or API keys
+- production logs
+- database dumps
+- customer screenshots
+- private deployment scripts
+- internal-only URLs or access tokens
+
+## Contact
+
+For product or technical questions, use the contact channels listed on the public Qlockify website.
+