fix: Add customfeeds.conf for local SecuBox package feed

- Create /etc/opkg/customfeeds.conf with secubox feed pre-configured
- Install file via Makefile instead of postinst script
- Mark as conffile to preserve user modifications on upgrade
- Add .gitignore to exclude built .ipk files from git tracking
  (packages are embedded at build time by embed_local_feed)

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

package/secubox/luci-app-secubox-bonus/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=luci-app-secubox-bonus
 PKG_VERSION:=0.2.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_ARCH:=all
 PKG_LICENSE:=Apache-2.0
 PKG_MAINTAINER:=CyberMind <contact@cybermind.fr>
@@ -14,6 +14,10 @@ LUCI_PKGARCH:=all
 
 include $(TOPDIR)/feeds/luci/luci.mk
 
+define Package/luci-app-secubox-bonus/conffiles
+/etc/opkg/customfeeds.conf
+endef
+
 define Package/luci-app-secubox-bonus/install
 	# Documentation and static content
 	$(INSTALL_DIR) $(1)/www/luci-static/secubox
@@ -25,6 +29,10 @@ define Package/luci-app-secubox-bonus/install
 		$(CP) ./root/www/secubox-feed/* $(1)/www/secubox-feed/; \
 	fi
 
+	# opkg custom feeds configuration
+	$(INSTALL_DIR) $(1)/etc/opkg
+	$(INSTALL_CONF) ./root/etc/opkg/customfeeds.conf $(1)/etc/opkg/customfeeds.conf
+
 	# RPCD backend for package management
 	$(INSTALL_DIR) $(1)/usr/libexec/rpcd
 	$(INSTALL_BIN) ./root/usr/libexec/rpcd/luci.secubox-store $(1)/usr/libexec/rpcd/
@@ -45,10 +53,6 @@ endef
 define Package/luci-app-secubox-bonus/postinst
 #!/bin/sh
 [ -n "$${IPKG_INSTROOT}" ] || {
-	# Add local feed to opkg if not already present
-	if ! grep -q "secubox-feed" /etc/opkg/customfeeds.conf 2>/dev/null; then
-		echo "src/gz secubox file:///www/secubox-feed" >> /etc/opkg/customfeeds.conf
-	fi
 	# Restart rpcd to load new backend
 	/etc/init.d/rpcd restart
 	rm -rf /tmp/luci-modulecache /tmp/luci-indexcache 2>/dev/null

package/secubox/luci-app-secubox-bonus/root/etc/opkg/customfeeds.conf

@@ -0,0 +1,5 @@
+# SecuBox Local Package Feed
+# Pre-built packages available for offline installation
+# Managed by luci-app-secubox-bonus
+
+src/gz secubox file:///www/secubox-feed

package/secubox/luci-app-secubox-bonus/root/www/secubox-feed/.gitignore

@@ -0,0 +1,7 @@
+# Built packages are populated during build
+# Do not commit binary files to git
+*.ipk
+*.apk
+Packages
+Packages.gz
+apps-local.json

package/secubox/luci-app-secubox-bonus/root/www/secubox-feed/.gitkeep

@@ -1 +0,0 @@
-# SecuBox Local Package Feed\n\nThis directory is populated during build with .ipk packages.\nDo not commit built packages to git.