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/extras/dev/jellyfin.sh

@@ -1,4 +1,15 @@
-# jellyfin.sh — Jellyfin Media Server installation (native repo)
+#!/usr/bin/env bash
+# jellyfin.sh — Jellyfin Media Server installation (extrepo)
+
+_enable_jellyfin_repo() {
+    if [ ! -f /etc/apt/sources.list.d/extrepo_jellyfin.sources ]; then
+        if ! command -v extrepo &>/dev/null; then
+            _run_cmd "extrepo" "sudo apt install -y extrepo" "Installing extrepo..."
+        fi
+        _run_cmd "Jellyfin" "sudo extrepo enable jellyfin" "Enabling Jellyfin repository..."
+    fi
+    _run_cmd "APT Update" "sudo apt update" "Updating package lists..."
+}
 
 install_jellyfin() {
     local ver
@@ -8,29 +19,7 @@ install_jellyfin() {
 Repository: repo.jellyfin.org/debian
 Version:    ${ver:-unknown}"; then
 
-        # 1. Prerequisites
-        ! is_installed "curl" && _run_install "curl"
-        ! is_installed "gpg"  && _run_install "gpg"
-        sudo install -d -m 0755 /etc/apt/keyrings
-
-        # 2. GPG key
-        echo -e "${GREEN}[+]${NC} Adding Jellyfin GPG key..."
-        curl -fsSL "https://repo.jellyfin.org/jellyfin_team.gpg.key" \
-            | sudo gpg --dearmor -o /etc/apt/keyrings/jellyfin.gpg
-
-        # 3. Deb822 .sources file
-        echo -e "${GREEN}[+]${NC} Adding Jellyfin repository..."
-        sudo tee /etc/apt/sources.list.d/jellyfin.sources > /dev/null << EOF
-Types: deb
-URIs: https://repo.jellyfin.org/debian
-Suites: ${DEBIAN_CODENAME}
-Components: main
-Architectures: $(dpkg --print-architecture)
-Signed-By: /etc/apt/keyrings/jellyfin.gpg
-EOF
-
-        # 4. Update + install
-        _run_cmd "APT Update" "sudo apt update" "Updating package lists..."
+        _enable_jellyfin_repo
         _run_cmd "Jellyfin" "sudo DEBIAN_FRONTEND=noninteractive apt install -y jellyfin" "Installing Jellyfin..."
 
         echo -e "${GREEN}Jellyfin Server installed. Web interface available at http://localhost:8096${NC}"