Add wired networking configuration and sudo requirement

- Add DNS configuration with fallback servers (8.8.8.8, 1.1.1.1, etc.)
- Create /etc/network/interfaces for wired DHCP networking
- Add init-network script to bring up wired interface on boot
- Update init.c to call network initialization
- Update documentation to include sudo in default packages
- Update README with network testing and binary installation guide
- Update ARCHITECTURE.md with networking strategy details

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

rootfs/etc/network/interfaces

@@ -0,0 +1,10 @@
+# SparkOS Network Configuration
+# Wired networking only for bootstrapping
+
+# Loopback interface
+auto lo
+iface lo inet loopback
+
+# Primary wired interface (DHCP)
+auto eth0
+iface eth0 inet dhcp

rootfs/etc/resolv.conf

@@ -0,0 +1,6 @@
+# SparkOS DNS Configuration
+# Fallback to public DNS servers for reliability
+nameserver 8.8.8.8
+nameserver 8.8.4.4
+nameserver 1.1.1.1
+nameserver 1.0.0.1