feat(main): integrate new modules and remove installer phase

Remove dependency on void-installer by integrating new modules:
- Source packages.sh, locale.sh, users.sh, services.sh
- Remove installer.sh sourcing
- Add 4 new phases after mounts: packages, locale, users, services
- Remove run_installer() phase
- Remove SKIP_INSTALLER flag and --skip-installer option

Decision: Execute new phases in logical order.
Packages must install before locale (needs glibc-locales package).
Locale before users (user shell may depend on locale).
Users before services (services may need user context).

Workflow change:
Before: Mounts → void-installer (manual) → Post-Install
After:  Mounts → Packages → Locale → Users → Services → Post-Install

Alternative considered: Keep installer.sh as optional fallback
rejected. Clean break eliminates maintenance burden and reduces
complexity. Users who need custom package selection can modify
packages.sh directly.

Trade-off: Removes flexibility of void-installer's package
selection UI. Accepted because:
1. Requirements explicitly exclude GUI/TUI components
2. Config file support (future) will provide customization
3. Simpler codebase easier to maintain and debug

Module sourcing order preserves dependency chain:
logging → config → sanity → disk ops → installation → rollback

src/installer.sh

@@ -1,71 +0,0 @@
-#!/usr/bin/env bash
-
-# === Motivation ===
-# Keep the official installer as the configuration authority.
-
-# === Problem Statement ===
-# We need a clean handoff so the installer uses existing mounts without reformatting.
-
-# === Scope ===
-# In scope: instructions and guardrails for the user during the installer run.
-# Out of scope: automated installer configuration.
-
-# === Concepts ===
-# Handoff: a pause where the wrapper delegates to the installer.
-
-# === Decisions ===
-# Provide clear, minimal guidance to avoid overriding prepared filesystems.
-# Support only CLI installer flow to keep guidance consistent.
-
-# === Alternatives Considered ===
-# Fully scripted installation rejected for this phase.
-
-# === Constraints ===
-# The wrapper must not hide or alter installer behavior.
-
-# === Open Questions ===
-# Should we provide a checklist or step-by-step guide during the installer handoff?
-# How do we detect if the installer reformatted filesystems against our intent?
-# Should we monitor the installer process, or fully delegate control?
-
-# === Success Criteria ===
-# The installer completes using the prepared mounts without reformatting.
-
-run_installer() {
-  : "${MOUNT_ROOT:?Mount root is required}"
-  : "${ESP_MOUNT:?ESP mount path is required}"
-  if ! findmnt "$MOUNT_ROOT" >/dev/null 2>&1; then
-    die "Mount root not found: $MOUNT_ROOT"
-  fi
-  if ! findmnt "$ESP_MOUNT" >/dev/null 2>&1; then
-    die "ESP mount not found: $ESP_MOUNT"
-  fi
-
-  log_info "Installer handoff: use the prepared mounts without formatting."
-  log_info "In the installer: choose manual partitioning and only set mountpoints."
-
-  if [[ "${SKIP_INSTALLER:-0}" -eq 1 ]]; then
-    log_warn "Skipping installer per request."
-    return 0
-  fi
-
-  read -r -p "Press Enter to launch void-installer..." _
-
-  if command -v void-installer >/dev/null 2>&1; then
-    void-installer
-  else
-    log_warn "void-installer not found. Run it manually in another shell."
-  fi
-
-  read -r -p "Press Enter once the installer is complete..." _
-
-  # Verify critical mounts are still intact after installer
-  if ! findmnt "$MOUNT_ROOT" >/dev/null 2>&1; then
-    die "Root mount disappeared after installer. The installer may have reformatted the filesystem."
-  fi
-  if ! findmnt "$ESP_MOUNT" >/dev/null 2>&1; then
-    die "ESP mount disappeared after installer. The installer may have reformatted the filesystem."
-  fi
-
-  log_info "Mount verification passed."
-}

src/main.sh

@@ -72,23 +72,27 @@ source "$SCRIPT_DIR/encryption.sh"
 source "$SCRIPT_DIR/filesystems.sh"
 # shellcheck source=src/mounts.sh
 source "$SCRIPT_DIR/mounts.sh"
-# shellcheck source=src/installer.sh
-source "$SCRIPT_DIR/installer.sh"
+# shellcheck source=src/packages.sh
+source "$SCRIPT_DIR/packages.sh"
+# shellcheck source=src/locale.sh
+source "$SCRIPT_DIR/locale.sh"
+# shellcheck source=src/users.sh
+source "$SCRIPT_DIR/users.sh"
+# shellcheck source=src/services.sh
+source "$SCRIPT_DIR/services.sh"
 # shellcheck source=src/postinstall.sh
 source "$SCRIPT_DIR/postinstall.sh"
 # shellcheck source=src/rollback.sh
 source "$SCRIPT_DIR/rollback.sh"
 
 DRY_RUN=0
-SKIP_INSTALLER=0
 CURRENT_PHASE=""
 
 usage() {
   cat <<USAGE
-Usage: ./main.sh [--dry-run] [--skip-installer]
+Usage: ./main.sh [--dry-run]
 
   --dry-run         Print configuration summary and exit
-  --skip-installer  Skip launching void-installer (manual run)
 USAGE
 }
 
@@ -98,9 +102,6 @@ parse_args() {
       --dry-run)
         DRY_RUN=1
         ;;
-      --skip-installer)
-        SKIP_INSTALLER=1
-        ;;
       -h|--help)
         usage
         exit 0
@@ -153,10 +154,14 @@ main() {
   run_phase "encryption" encrypt_root
   run_phase "filesystems" format_filesystems
   run_phase "mounts" mount_filesystems
-  run_phase "installer" run_installer
+  run_phase "packages" packages_install
+  run_phase "locale" locale_configure
+  run_phase "users" users_setup
+  run_phase "services" services_configure
   run_phase "post-install" postinstall_run
 
-  log_info "Installation wrapper completed."
+  log_info "Installation completed successfully."
+  log_info "System is ready to boot."
   log_info "Log file: ${LOG_FILE}"
 }