Refactor: Series A clean structure

docs/SECURITY.md

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+# Security & Data Handling
+
+Version: v0.6.0 Beta
+
+------------------------------------------------------------------------
+
+## Design Principles
+
+-   Offline-first architecture
+-   No external API dependency required
+-   Local database storage
+-   Segmented Print Agent process
+
+------------------------------------------------------------------------
+
+## Data Storage
+
+-   Transaction data stored locally
+-   Backup performed hourly
+-   No public exposure of POS interface
+
+------------------------------------------------------------------------
+
+## Network
+
+-   Optional secure tunnel for backup transfer
+-   No inbound public access required
+
+------------------------------------------------------------------------
+
+## Access Control
+
+-   SUADMIN restricted access
+-   No public login system
+-   KlubKort used for payments only
+
+------------------------------------------------------------------------
+
+## Recommendations
+
+-   Restrict physical access to terminal
+-   Secure Windows account
+-   Regularly verify backups