feat: Add python3-zstandard package for native build

Native OpenWrt package for zstandard compression library.
Can be used as alternative to pip installation.

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

package/secubox/python3-zstandard/Makefile

@@ -0,0 +1,46 @@
+#
+# Copyright (C) 2025 CyberMind.fr (SecuBox)
+#
+# This is free software, licensed under the MIT License.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=python3-zstandard
+PKG_VERSION:=0.23.0
+PKG_RELEASE:=1
+
+PYPI_NAME:=zstandard
+PKG_HASH:=b2d8c62d08e7255f68f7a740bae85b3c9b8e5466baa9cbf7f57f1cde0ac6bc09
+
+PKG_LICENSE:=BSD-3-Clause
+PKG_LICENSE_FILES:=LICENSE
+PKG_MAINTAINER:=CyberMind <contact@cybermind.fr>
+
+PKG_BUILD_DEPENDS:=python-cffi/host
+
+include $(TOPDIR)/feeds/packages/lang/python/pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include $(TOPDIR)/feeds/packages/lang/python/python3-package.mk
+
+define Package/python3-zstandard
+  SECTION:=lang
+  CATEGORY:=Languages
+  SUBMENU:=Python
+  TITLE:=Zstandard compression bindings
+  URL:=https://github.com/indygreg/python-zstandard
+  DEPENDS:= \
+      +python3-light \
+      +python3-cffi \
+      +libzstd
+endef
+
+define Package/python3-zstandard/description
+  Python bindings to the Zstandard (zstd) compression library.
+  Provides both CFFI and C extension backends for optimal performance.
+  Required by mitmproxy for compressed content handling.
+endef
+
+$(eval $(call Py3Package,python3-zstandard))
+$(eval $(call BuildPackage,python3-zstandard))
+$(eval $(call BuildPackage,python3-zstandard-src))