dual-gpu fix & nvme

- Replaced the restrictive head -n1 hardware parsing with a dynamic while read loop. The script now fully detects and registers multiple coexisting GPUs (Intel+Nvidia / AMD+Nvidia).
- Rewrote install_gpu_drivers() in modules/gpu.sh from a mutually exclusive case block to independent, sequential if conditions. Laptops now install both integrated firmware (Intel/AMD with non-free VA-API acceleration) and dedicated graphics stacks (Nvidia driver + 32-bit libs for Steam) seamlessly in a single pass.
- Improved Nvidia Kepler architecture guards under Debian 13 (Trixie). The script now safely skips missing legacy Nvidia packages without aborting or crashing the remaining Intel/AMD configurations.
- Added nvme-cli utility installation across all Debian versions. For Bookworm and Trixie, it features dynamic hardware validation via lsblk transport filtering and interactive, real-time SMART log viewing with an execution screen-pause.
- Created a brand new standalone module (modules/extras/dev/jellyfin.sh) to cleanly inject Jellyfin Media Server across Debian 11, 12, and 13 using its official setup script, protected by strict SHA256 checksum validations and guaranteed error-cleanup.
- Added OpenRGB to the Gaming menu for Debian 12 and 13. Implemented secure curl downloads with an emulated Chrome User-Agent to bypass Codeberg bot blocks, complete with automatic i2c-dev module configuration, user groups provisioning, and udev permission rules execution.
- Standardized menu headers across 15 separate files using a centralized readonly SCROLL_HINT=" [↑↓]" variable, replacing messy hardcoded strings with clean, uniform Whiptail instructions.
- update README.md

modules/extras/dev/jellyfin.sh

@@ -0,0 +1,32 @@
+# jellyfin.sh — Jellyfin Media Server installation
+
+install_jellyfin() {
+    local tmpdir="/tmp/jellyfin_install"
+    mkdir -p "${tmpdir}"
+
+    _run_cmd "Jellyfin" "curl -sSL -o ${tmpdir}/install-debuntu.sh https://repo.jellyfin.org/install-debuntu.sh" "Downloading Jellyfin repository script..."
+    _run_cmd "Jellyfin" "curl -sSL -o ${tmpdir}/install-debuntu.sh.sha256sum https://repo.jellyfin.org/install-debuntu.sh.sha256sum" "Downloading checksum..."
+
+    if [ ! -s "${tmpdir}/install-debuntu.sh" ] || [ ! -s "${tmpdir}/install-debuntu.sh.sha256sum" ]; then
+        echo -e "${RED}[-]${NC} Download failed: script or checksum is empty or missing."
+        rm -rf "${tmpdir}"
+        return 1
+    fi
+
+    echo -e "${GREEN}[+]${NC} Verifying checksum..."
+    if ! (cd "${tmpdir}" && sha256sum -c install-debuntu.sh.sha256sum); then
+        echo -e "${RED}[-]${NC} Checksum verification failed. The downloaded script may be corrupted."
+        rm -rf "${tmpdir}"
+        return 1
+    fi
+
+    echo -e "${GREEN}[+]${NC} Running Jellyfin repository setup..."
+    if ! sudo bash "${tmpdir}/install-debuntu.sh"; then
+        echo -e "${RED}[-]${NC} Jellyfin installation failed."
+        rm -rf "${tmpdir}"
+        return 1
+    fi
+
+    rm -rf "${tmpdir}"
+    echo -e "${GREEN}Jellyfin Server installed. Web interface available at http://localhost:8096${NC}"
+}