Improve launcher initialization - silent detection after first run

Problem: System detection printed 6 [INFO] messages every time launcher started, making it feel slow and repetitive.

Solution: Only show detection messages on first run when SYS_DETECTION_COMPLETE is not set. Subsequent runs are silent while still performing detection.

Changes:
- lib/system-detect.sh: Added silent detection check to all detect_* functions
  Lines 40, 99, 137, 186, 213, 278: [ -n "$SYS_DETECTION_COMPLETE" ] || print_info
- REFDB_FORMAT.txt: Added documentation preferences section

Result: Clean, fast launcher after first initialization

lib/system-detect.sh

@@ -36,7 +36,8 @@ export SYS_FIREWALL_ACTIVE=""
 #############################################################################
 
 detect_control_panel() {
-    print_info "Detecting control panel..."
+    # Silent detection if already detected
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting control panel..."
 
     # cPanel
     if [ -f "/usr/local/cpanel/version" ]; then
@@ -95,7 +96,7 @@ detect_control_panel() {
 #############################################################################
 
 detect_os() {
-    print_info "Detecting operating system..."
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting operating system..."
 
     if [ -f /etc/os-release ]; then
         source /etc/os-release
@@ -133,7 +134,7 @@ detect_os() {
 #############################################################################
 
 detect_web_server() {
-    print_info "Detecting web server..."
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting web server..."
 
     # Apache
     if command_exists httpd; then
@@ -182,7 +183,7 @@ detect_web_server() {
 #############################################################################
 
 detect_database() {
-    print_info "Detecting database server..."
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting database server..."
 
     if command_exists mysql; then
         local version_output=$(mysql --version 2>/dev/null)
@@ -209,7 +210,7 @@ detect_database() {
 #############################################################################
 
 detect_php_versions() {
-    print_info "Detecting PHP versions..."
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting PHP versions..."
 
     SYS_PHP_VERSIONS=()
 
@@ -274,7 +275,7 @@ detect_cloudflare() {
 #############################################################################
 
 detect_firewall() {
-    print_info "Detecting firewall..."
+    [ -n "$SYS_DETECTION_COMPLETE" ] || print_info "Detecting firewall..."
 
     # CSF/LFD
     if [ -f "/etc/csf/csf.conf" ]; then