feat(installer): add main function and complete install.sh

Appends the main() entry point that wires together all installer phases:
arg parsing, config loading, rerun detection, prerequisites, auto-detect,
interactive prompts, config merge/validate, password generation, file
generation, docker pull/up, health verification, and output printing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

installer/install.sh

@@ -636,7 +636,7 @@ generate_compose_file() {
 
   cat >> "$f" << 'EOF'
 # Cameleer SaaS Platform
-# Generated by Cameleer installer <20> do not edit manually
+# Generated by Cameleer installer <20> do not edit manually
 
 services:
   traefik:
@@ -950,7 +950,7 @@ verify_health() {
 
   echo ""
   if [ $failed -ne 0 ]; then
-    log_error "Installation verification failed. Stack is running <20> check logs."
+    log_error "Installation verification failed. Stack is running <20> check logs."
     exit 1
   fi
   log_success "All services healthy."
@@ -1031,7 +1031,7 @@ generate_install_doc() {
   [ "$TLS_MODE" = "custom" ] && tls_desc="Custom certificate"
 
   cat > "$f" << EOF
-# Cameleer SaaS <20> Installation Documentation
+# Cameleer SaaS <20> Installation Documentation
 
 ## Installation Summary
 
@@ -1296,3 +1296,77 @@ handle_rerun() {
       ;;
   esac
 }
+
+# --- Main ---
+
+main() {
+  parse_args "$@"
+
+  print_banner
+
+  # Load config sources (CLI already loaded via parse_args)
+  if [ -n "$CONFIG_FILE_PATH" ]; then
+    load_config_file "$CONFIG_FILE_PATH"
+  fi
+  load_env_overrides
+
+  # Check for existing installation
+  detect_existing_install
+  if [ "$IS_RERUN" = true ]; then
+    show_rerun_menu
+    handle_rerun
+  fi
+
+  # Prerequisites
+  check_prerequisites
+
+  # Auto-detect defaults
+  auto_detect
+
+  # Interactive prompts (unless silent)
+  if [ "$MODE" != "silent" ]; then
+    select_mode
+    if [ "$MODE" = "expert" ]; then
+      run_expert_prompts
+    else
+      run_simple_prompts
+    fi
+  fi
+
+  # Merge remaining defaults and validate
+  merge_config
+  validate_config
+
+  # Generate passwords for any empty values
+  generate_passwords
+
+  # Create install directory
+  mkdir -p "$INSTALL_DIR"
+
+  # Copy custom certs if provided
+  if [ "$TLS_MODE" = "custom" ]; then
+    copy_certs
+  fi
+
+  # Generate configuration files
+  generate_env_file
+  generate_compose_file
+  write_config_file
+
+  # Pull and start
+  docker_compose_pull
+  docker_compose_up
+
+  # Verify health
+  verify_health
+
+  # Generate output files
+  generate_credentials_file
+  generate_install_doc
+
+  # Print results
+  print_credentials
+  print_summary
+}
+
+main "$@"