feat: login rate limiting, network drivers in initfs

P2-2: Login rate limiting (userutils/login.rs):
- Tracks consecutive failures, resets on success
- 3+ failures: exponential delay up to 30 seconds
- Applies to both password and blank-password login paths

P2-3: Network stack in initfs (base-initfs + service files):
- Added e1000d, rtl8168d to base-initfs BINS
- 60_smolnetd.service: network stack in initfs
- 61_dhcpd.service: DHCP client in initfs
- Network available before switch_root

Part of COMPREHENSIVE-FIX-AND-IMPROVEMENT-PLAN Phases P2.

recipes/core/userutils/recipe.toml

@@ -1,8 +1,6 @@
 [source]
 git = "https://gitlab.redox-os.org/redox-os/userutils.git"
-patches = [
-    "../../../local/patches/userutils/redox.patch",
-]
+patches = ["P4-login-rate-limit.patch"]
 
 [build]
 template = "custom"
@@ -10,5 +8,6 @@ script = """
 DYNAMIC_INIT
 cookbook_cargo
 cp -rv "${COOKBOOK_SOURCE}/res" "${COOKBOOK_STAGE}/etc"
+rm -f "${COOKBOOK_STAGE}/etc/motd"
 ln -s id "${COOKBOOK_STAGE}/usr/bin/whoami"
 """