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/gpu/_helpers.sh

@@ -67,6 +67,22 @@ is_nvidia_pascal() {
     echo false
 }
 
+is_nvidia_blackwell() {
+    local dev_id
+    dev_id=$(lspci -nn | grep -iE "VGA|3D" | grep -i nvidia | grep -oP '10de:\K[0-9a-fA-F]+' | head -n1)
+    [ -z "$dev_id" ] && { echo false; return; }
+
+    local dev_int
+    dev_int=$((16#${dev_id,,}))
+
+    # Blackwell (GB20x) rango bajo: 0x2900 – 0x29BF
+    if [ "$dev_int" -ge $((16#2900)) ] && [ "$dev_int" -le $((16#29BF)) ]; then echo true; return; fi
+    # Blackwell (GB20x) rango alto: 0x2B80 – 0x31FF
+    if [ "$dev_int" -ge $((16#2B80)) ] && [ "$dev_int" -le $((16#31FF)) ]; then echo true; return; fi
+
+    echo false
+}
+
 _install_mesa_backports() {
     if [ "$(is_backports_enabled)" != "true" ]; then
         install_mesa_stable