Separate component building from copying for better architecture

- Remove component copying from build functions (build_zinit, build_rfs, etc)
- Add initramfs_copy_components() function to copy built components to initramfs
- Add components_copy stage between init_script and modules_setup
- Fix components_verify to check built components (not initramfs locations)
- Now supports partial builds: build components separately, copy later
- All 4 components (zinit 8.1M, rfs 13M, mycelium 21M, corex 4.0M) working

scripts/build.sh

@@ -262,6 +262,10 @@ function main_build_process() {
         initramfs_install_init_script "$INSTALL_DIR" "${CONFIG_DIR}/init"
     }
     
+    function stage_components_copy() {
+        initramfs_copy_components "$INSTALL_DIR" "$COMPONENTS_DIR"
+    }
+    
     function stage_modules_setup() {
         # Calculate full kernel version (needed for incremental builds when kernel_modules stage is skipped)
         local full_kernel_version=$(kernel_get_full_version "$KERNEL_VERSION" "$KERNEL_CONFIG")
@@ -328,6 +332,7 @@ function main_build_process() {
     stage_run "kernel_modules" stage_kernel_modules
     stage_run "zinit_setup" stage_zinit_setup
     stage_run "init_script" stage_init_script
+    stage_run "components_copy" stage_components_copy
     stage_run "modules_setup" stage_modules_setup
     stage_run "modules_copy" stage_modules_copy
     stage_run "cleanup" stage_cleanup