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

Dockerfile

@@ -8,6 +8,7 @@ RUN apk add --no-cache \
     upx \
     git \
     wget \
+    curl \
     tar \
     gzip \
     xz \
@@ -23,7 +24,15 @@ RUN apk add --no-cache \
     findutils \
     grep \
     sed \
-    coreutils
+    coreutils \
+    diffutils \
+    flex \
+    bison \
+    bc \
+    elfutils-dev \
+    ncurses-dev \
+    kmod \
+    pahole
 
 # Setup rustup with stable and musl target
 RUN rustup-init -y && \