Add Maintenance Window Policy

Maintenance-Window-Policy.md

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+To maintain consistency and reduce customer impact, we adhere to a strict maintenance schedule.
+
+## Standard Window
+
+- **Every Sunday, 7 PM – 9 PM Eastern**
+- Non-emergency changes must occur during this window
+
+## What’s Allowed
+
+- OS & kernel updates
+- Docker/image upgrades
+- ZFS snapshots & cleanup
+- Rolling restarts of containers
+
+## Emergencies
+
+- Critical security patches can bypass the window
+- All emergency changes must be logged and reviewed
+
+## Notifications
+
+- Posted on Mastodon at least 1 hour before the window begins
+- Clients notified via WHMCS if it will affect their service