firmware & wireless refactor + extrepo Migration

- Created standalone modules/bluetooth.sh  for `_install_bluetooth_stack()` with desktop-aware frontend selection (bluedevil/KDE, blueman/XFCE/other). Extracted from `firmware.sh`, reducing it from 438 to 369 lines.

- Added `detect_desktop_environment()` and `detect_audio_server()` functions in `utils.sh` with new globals `DESKTOP_ENV=""` and `AUDIO_SERVER=""`.

- New `found_active_wifi` flag detects Qualcomm Atheros AR9485 PCI chips without loaded firmware, displaying `(no driver — install firmware)` instead of silently disappearing. Auto-installs `firmware-atheros + firmware-linux-nonfree` after Firmware & Wireless Setup.

- New `is_nvidia_blackwell()` detects GPUs in ranges `0x2900–0x29BF` and `0x2B80–0x31FF`. Added `_enable_cuda_repo()` helper for extrepo-based CUDA installation with APT pinning. DKMS verification blocks added to all `_install_nvidia_*` functions.

- Standardized repository enablement across 7 modules using `_enable_*_repo()` helpers:
  - `internet.sh`: Firefox/Floorp/LibreWolf, Pale Moon, Tailscale, Mullvad VPN/Browser, ProtonVPN
  - `jellyfin.sh`, `programming.sh` (VSCodium), `java.sh` (Temurin)
  - New `extras/office/office.sh`: OnlyOffice + LibreOffice with language detection

- The main script was reduced from 233 to 137 lines. Created new `modules/sysinfo.sh` (97 lines) for `_show_sysinfo()`. Source chain: `utils.sh → sysinfo.sh → sudo_config.sh → repos → firmware.sh → bluetooth.sh → gpu.sh → kernel.sh → gaming.sh → extras.sh → zram.sh → java.sh`.

- Renamed menu to `"Firmware, Wireless & Bluetooth"`. Translated NTP dialog (English), basic programs install message, and NVIDIA 32-bit legacy messages.

modules/utils.sh

@@ -19,6 +19,8 @@ KERNEL_VERSION=""
 DISPLAY_SERVER="unknown"
 STORAGE_SUMMARY=""
 WIFI_CHIPSET=""
+DESKTOP_ENV=""
+AUDIO_SERVER=""
 
 # --------------------------
 # Pre-flight checks
@@ -47,11 +49,11 @@ check_system_time() {
     local year
     year=$(date +%Y)
     if [ "$year" -lt 2026 ]; then
-        local msg="Se ha detectado que la fecha/hora de su sistema está desconfigurada\n"
-        msg+="($(date '+%Y-%m-%d %H:%M')), lo que impedirá que los repositorios\n"
-        msg+="de Debian funcionen correctamente.\n\n"
-        msg+="¿Desea que el script intente sincronizar la hora automáticamente\n"
-        msg+="mediante la red (NTP) y configurar timedatectl?"
+        local msg="System date/time appears to be incorrect\n"
+        msg+="($(date '+%Y-%m-%d %H:%M')). This will prevent Debian\n"
+        msg+="repositories from working properly.\n\n"
+        msg+="Attempt automatic NTP synchronization?\n"
+        msg+="(requires network access and timedatectl)"
         if _confirm "System Date" "$msg"; then
             sync_system_time
             local new_year
@@ -365,6 +367,31 @@ detect_storage() {
     STORAGE_SUMMARY="$result"
 }
 
+# ---------------------------------------
+# Desktop environment detection
+# ---------------------------------------
+detect_desktop_environment() {
+    case "${XDG_CURRENT_DESKTOP:-}" in
+        *GNOME*) DESKTOP_ENV="gnome" ;;
+        *KDE*)   DESKTOP_ENV="kde" ;;
+        *XFCE*)  DESKTOP_ENV="xfce" ;;
+        *)       DESKTOP_ENV="other" ;;
+    esac
+}
+
+# ---------------------------------------
+# Audio server detection (PipeWire / PulseAudio)
+# ---------------------------------------
+detect_audio_server() {
+    if command -v pw-cli &>/dev/null && pw-cli info &>/dev/null 2>&1; then
+        AUDIO_SERVER="pipewire"
+    elif command -v pactl &>/dev/null; then
+        AUDIO_SERVER="pulseaudio"
+    else
+        AUDIO_SERVER="none"
+    fi
+}
+
 # ---------------------------------------
 # Intel HD Graphics generation detection
 # ---------------------------------------