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/bluetooth.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+# modules/bluetooth.sh
+# Requires: modules/utils.sh (globals + helpers), modules/firmware.sh (PCI_BT_DEVS, USB_BT_DEVS, USB_WIFI_DEVS)
+
+_install_bluetooth_stack() {
+    local has_bt=false
+    [ ${#PCI_BT_DEVS[@]} -gt 0 ] && has_bt=true
+    [ ${#USB_BT_DEVS[@]} -gt 0 ] && has_bt=true
+    if ! $has_bt; then
+        for dev in "${USB_WIFI_DEVS[@]}"; do
+            if echo "$dev" | grep -qi 'bluetooth'; then
+                has_bt=true; break
+            fi
+        done
+    fi
+    if ! $has_bt; then
+        echo "  → No Bluetooth hardware detected, skipping."
+        return
+    fi
+
+    if is_installed bluez && is_installed bluez-utils; then
+        echo "  → Bluetooth stack already installed."
+        service_enable_only=true
+    fi
+
+    if [ ! ${service_enable_only:-false} = true ]; then
+        local bt_pkgs=()
+        ! is_installed bluez      && bt_pkgs+=(bluez)
+        ! is_installed bluez-utils && bt_pkgs+=(bluez-utils)
+        ! is_installed bluez-obexd && bt_pkgs+=(bluez-obexd)
+        if [ ${#bt_pkgs[@]} -gt 0 ]; then
+            _run_cmd "Bluetooth" "sudo DEBIAN_FRONTEND=noninteractive apt install -y ${bt_pkgs[*]}" "Installing Bluetooth stack..."
+        fi
+    fi
+
+    if command -v rfkill &>/dev/null; then
+        if rfkill list bluetooth 2>/dev/null | grep -q "Soft blocked: yes"; then
+            echo "  → Unblocking Bluetooth (rfkill)..."
+            sudo rfkill unblock bluetooth
+        fi
+    fi
+
+    case "${DESKTOP_ENV:-other}" in
+        kde)
+            if ! is_installed bluedevil; then
+                _run_cmd "Bluetooth" "sudo DEBIAN_FRONTEND=noninteractive apt install -y bluedevil" "Installing bluedevil..."
+            fi
+            if [ "${AUDIO_SERVER:-}" = "pipewire" ]; then
+                ! is_installed pipewire-pulse && _run_cmd "Bluetooth" "sudo DEBIAN_FRONTEND=noninteractive apt install -y pipewire-pulse" "Installing pipewire-pulse..."
+                ! is_installed wireplumber && _run_cmd "Bluetooth" "sudo DEBIAN_FRONTEND=noninteractive apt install -y wireplumber" "Installing wireplumber..."
+            fi
+            ;;
+        gnome)
+            echo "  → GNOME Bluetooth support already in gnome-control-center."
+            ;;
+        xfce|other)
+            if ! is_installed blueman; then
+                _run_cmd "Bluetooth" "sudo DEBIAN_FRONTEND=noninteractive apt install -y blueman" "Installing blueman..."
+            fi
+            ;;
+    esac
+
+    if ! systemctl is-enabled bluetooth &>/dev/null 2>&1; then
+        sudo systemctl enable bluetooth 2>/dev/null || true
+    fi
+    if ! systemctl is-active bluetooth &>/dev/null 2>&1; then
+        sudo systemctl start bluetooth 2>/dev/null || true
+    fi
+
+    _msg "Bluetooth Setup" "Bluetooth stack installed.\n\nA session restart or reboot is\nrecommended to load the desktop\napplets and tray icons." 10 60
+}