[client] Add Wails3 + React desktop UI scaffold

Stage 1 of the client/ui (Fyne) replacement. Adds a new client/ui-wails
module that runs on Linux/macOS/Windows from a single React + Vite +
Tailwind frontend driven by a thin gRPC services layer in Go.

- Single-module integration (no submodule): merge Wails3 into root go.mod
  with build tags !android !ios !freebsd !js so cross-compiles on those
  targets exclude the package automatically.
- Seven gRPC-bound services: Connection, Settings, Networks, Profiles,
  Debug, Update, Peers. Peers bridges Status polling and SubscribeEvents
  to the Wails event bus (netbird:status, netbird:event).
- Tray + window shell mirrors the Fyne menu 1:1 with hide-on-close,
  SIGUSR1 / Windows named-event for external "show window" triggers.
- React pages cover functional parity for Status, Settings (3 tabs),
  Networks (3 tabs), Profiles, Debug, Update, QuickActions, LoginUrl.
- SVG-sourced tray icons (12 source SVGs incl. macOS template variants)
  rasterized to PNG via task common:generate:tray:icons.
- Linux launcher sets WEBKIT_DISABLE_DMABUF_RENDERER=1 in the .desktop
  Exec= line and in task linux:run so the app renders correctly under
  RDP, VirtualBox, KVM, and bare WMs (Fluxbox/dwm) without DRM access.

client/ui-wails/build/linux/nfpm/nfpm.yaml

@@ -0,0 +1,67 @@
+# Feel free to remove those if you don't want/need to use them.
+# Make sure to check the documentation at https://nfpm.goreleaser.com
+#
+# The lines below are called `modelines`. See `:help modeline`
+
+name: "netbird-ui"
+arch: ${GOARCH}
+platform: "linux"
+version: "0.0.1"
+section: "default"
+priority: "extra"
+maintainer: ${GIT_COMMITTER_NAME} <${GIT_COMMITTER_EMAIL}>
+description: "NetBird desktop client"
+vendor: "NetBird"
+homepage: "https://wails.io"
+license: "MIT"
+release: "1"
+
+contents:
+  - src: "./bin/netbird-ui"
+    dst: "/usr/local/bin/netbird-ui"
+  - src: "./build/appicon.png"
+    dst: "/usr/share/icons/hicolor/128x128/apps/netbird-ui.png"
+  - src: "./build/linux/netbird-ui.desktop"
+    dst: "/usr/share/applications/netbird-ui.desktop"
+
+# Default dependencies for Debian 12/Ubuntu 22.04+ with WebKit 4.1
+depends:
+  - libgtk-3-0
+  - libwebkit2gtk-4.1-0
+
+# Distribution-specific overrides for different package formats and WebKit versions
+overrides:
+  # RPM packages for RHEL/CentOS/AlmaLinux/Rocky Linux (WebKit 4.0)
+  rpm:
+    depends:
+      - gtk3
+      - webkit2gtk4.1
+  
+  # Arch Linux packages (WebKit 4.1)  
+  archlinux:
+    depends:
+      - gtk3
+      - webkit2gtk-4.1
+
+# scripts section to ensure desktop database is updated after install
+scripts:
+  postinstall: "./build/linux/nfpm/scripts/postinstall.sh"
+  # You can also add preremove, postremove if needed
+  # preremove: "./build/linux/nfpm/scripts/preremove.sh"
+  # postremove: "./build/linux/nfpm/scripts/postremove.sh"
+
+# replaces:
+#   - foobar
+# provides:
+#   - bar
+# depends:
+#   - gtk3
+#   - libwebkit2gtk
+# recommends:
+#   - whatever
+# suggests:
+#   - something-else
+# conflicts:
+#   - not-foo
+#   - not-bar
+# changelog: "changelog.yaml"

client/ui-wails/build/linux/nfpm/scripts/postinstall.sh

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+#!/bin/sh
+
+# Update desktop database for .desktop file changes
+# This makes the application appear in application menus and registers its capabilities.
+if command -v update-desktop-database >/dev/null 2>&1; then
+  echo "Updating desktop database..."
+  update-desktop-database -q /usr/share/applications
+else
+  echo "Warning: update-desktop-database command not found. Desktop file may not be immediately recognized." >&2
+fi
+
+# Update MIME database for custom URL schemes (x-scheme-handler)
+# This ensures the system knows how to handle your custom protocols.
+if command -v update-mime-database >/dev/null 2>&1; then
+  echo "Updating MIME database..."
+  update-mime-database -n /usr/share/mime
+else
+  echo "Warning: update-mime-database command not found. Custom URL schemes may not be immediately recognized." >&2
+fi
+
+exit 0

client/ui-wails/build/linux/nfpm/scripts/postremove.sh

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+#!/bin/bash

client/ui-wails/build/linux/nfpm/scripts/preinstall.sh

@@ -0,0 +1 @@
+#!/bin/bash

client/ui-wails/build/linux/nfpm/scripts/preremove.sh

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+#!/bin/bash