fix: major build system improvements and container output issues

- Fix container output visibility with proper TTY handling and debug mode
- Fix build order: kernel modules built before initramfs creation
- Implement two-stage kernel build to resolve chicken-and-egg dependency
- Fix sed command issues in kernel configuration with direct execution
- Add diffutils package to container for proper kernel build support
- Enhance NIC module/firmware correlation with intelligent selection
- Fix module staging logic: all NICs loaded in stage1 before network up
- Add smart firmware installation based on module requirements
- Create comprehensive function documentation (scripts/functionlist.md)
- Add debug container script for troubleshooting

Major fixes:
* Container builds now show real-time output
* Kernel builds work with proper GNU diff support
* Module/firmware selection optimized for common hardware
* Build process handles dependencies correctly
* Documentation provides complete function reference

config/modules.conf

@@ -1,52 +1,34 @@
-# 2-stage module loading specification for Zero-OS Alpine initramfs
-# Based on existing configs/modules-essential.list
-# Format: STAGE:MODULE_NAME:FIRMWARE_FILES (optional)
+# Module loading specification for Zero-OS Alpine initramfs
+# Format: STAGE:MODULE_NAME:FIRMWARE_PACKAGE (optional)
+# Focus on most common NIC modules to ensure networking works on most hardware
 
-# Stage 1: Critical boot modules (loaded early for basic functionality)
-stage1:virtio_net
-stage1:virtio_scsi
-stage1:virtio_blk
-stage1:virtio_pci
-stage1:e1000
-stage1:e1000e
-stage1:scsi_mod
-stage1:sd_mod
-stage1:ahci
-stage1:nvme
+# Stage 1: ALL networking and essential boot modules
+# All NICs must be loaded BEFORE network can come up
+stage1:virtio_net:none                  # Virtio network (VMs, cloud)
+stage1:virtio_scsi:none                 # Virtio SCSI (VMs, cloud)
+stage1:virtio_blk:none                  # Virtio block (VMs, cloud)
+stage1:virtio_pci:none                  # Virtio PCI bus
+stage1:e1000:linux-firmware-intel      # Intel E1000 (very common)
+stage1:e1000e:linux-firmware-intel     # Intel E1000E (very common)
+stage1:r8169:linux-firmware-realtek    # Realtek (most common desktop/server)
+stage1:igb:linux-firmware-intel        # Intel Gigabit (servers)
+stage1:ixgbe:linux-firmware-intel      # Intel 10GbE (servers)
+stage1:i40e:linux-firmware-intel       # Intel 40GbE (modern servers)
+stage1:ice:linux-firmware-intel        # Intel E800 series (latest)
+stage1:8139too:none                     # Realtek 8139 (legacy)
+stage1:8139cp:none                      # Realtek 8139C+ (legacy)
+stage1:bnx2:linux-firmware-bnx2        # Broadcom NetXtreme
+stage1:bnx2x:linux-firmware-bnx2       # Broadcom NetXtreme II
+stage1:tg3:none                         # Broadcom Tigon3
+stage1:b44:none                         # Broadcom 44xx
+stage1:atl1:none                        # Atheros L1
+stage1:atl1e:none                       # Atheros L1E
+stage1:atl1c:none                       # Atheros L1C
+stage1:alx:none                         # Atheros Alx
+stage1:scsi_mod:none                    # SCSI subsystem
+stage1:sd_mod:none                      # SCSI disk support
+stage1:ahci:none                        # SATA AHCI
+stage1:nvme:none                        # NVMe storage
+stage1:tun:none                         # TUN/TAP for networking
+stage1:overlay:none                     # OverlayFS for containers
 
-# Stage 2: Extended hardware support (loaded after initial boot)
-stage2:igb
-stage2:ixgbe
-stage2:i40e
-stage2:ice
-stage2:r8169
-stage2:8139too
-stage2:8139cp
-stage2:bnx2
-stage2:bnx2x
-stage2:tg3
-stage2:b44
-stage2:atl1
-stage2:atl1e
-stage2:atl1c
-stage2:alx
-
-# Tunnel and container support
-stage2:tun
-stage2:overlay
-
-# Control Groups (cgroups) - essential for container management
-stage2:cgroup_pids
-stage2:cgroup_freezer
-stage2:cgroup_perf_event
-stage2:cgroup_device
-stage2:cgroup_cpuset
-stage2:cgroup_bpf
-stage2:memcg
-stage2:blkio_cgroup
-stage2:cpu_cgroup
-stage2:cpuacct
-stage2:hugetlb_cgroup
-stage2:net_cls_cgroup
-stage2:net_prio_cgroup
-stage2:devices_cgroup