Initial commit: DarkForge package repository (124 packages)

Package definitions for the complete DarkForge Linux system:
- core/  (67): base system, toolchain, kernel, utilities, dev tools
- extra/ (26): libraries, frameworks, drivers (nvidia-open, pipewire, mesa)
- desktop/ (19): Wayland stack, dwl compositor, terminals, applications
- gaming/ (12): Steam, Wine, Proton, gamemode, mangohud, PrismLauncher

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

extra/libpng/libpng.toml

@@ -0,0 +1,20 @@
+[package]
+name = "libpng"
+version = "1.6.47"
+description = "PNG reference library"
+url = "http://www.libpng.org/pub/png/libpng.html"
+license = "Libpng"
+
+[source]
+url = "https://downloads.sourceforge.net/libpng/libpng-${version}.tar.xz"
+sha256 = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+
+[dependencies]
+run = ["glibc", "zlib"]
+build = ["gcc", "make"]
+
+[build]
+system = "autotools"
+configure = """./configure --prefix=/usr --disable-static"""
+make = """make"""
+install = """make DESTDIR=${PKG} install"""