chore: initial repo setup with baseline config backup

- Pull current config from router (OpenWRT 24.10.2)
- Add backup, safe-apply, and push-all scripts
- Add CLAUDE.md with workflow rules and context
- Add network-map.md with current topology and planned VLANs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/dropbear

@@ -0,0 +1,7 @@
+
+config dropbear 'main'
+	option enable '1'
+	option PasswordAuth '0'
+	option RootPasswordAuth '0'
+	option Port '22'
+