chore(system-hub): Bump release to 0.4.6-r2

Updated luci-app-system-hub internal release version to r2.

Version update:
- luci-app-system-hub: 0.4.6-r1 → 0.4.6-r2

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

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

luci-app-system-hub/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=luci-app-system-hub
 PKG_VERSION:=0.4.6
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=Apache-2.0
 PKG_MAINTAINER:=CyberMind <contact@cybermind.fr>