[client] Declare GTK4/WebKitGTK runtime deps for the Linux UI packages

The 0.75.0 UI is built against GTK 4.14 (Ubuntu 24.04 runner) and Wails v3
calls gdk_monitor_get_scale (GTK 4.14+) unconditionally, but the deb/rpm
packages only depended on netbird. On distros shipping an older GTK4
(Ubuntu 22.04, RHEL 9, openSUSE Leap 15.6) the package installed fine and
then died at startup with a symbol lookup error (#6890).

Declare the real runtime dependencies so package managers reject the
install up front instead:

- deb: libgtk-4-1 (>= 4.14) and libwebkitgtk-6.0-4
- rpm: rich (boolean) dependencies that accept both the Fedora/RHEL and
  the SUSE package names, with the 4.14 floor:
    (gtk4 >= 4.14 or libgtk-4-1 >= 4.14)
    (webkitgtk6.0 or libwebkitgtk-6_0-4)

Rich deps are supported by dnf and zypper (RPM 4.13+); the pinned
goreleaser v2.16.0 -> nfpm v2.46.3 -> rpmpack v0.7.1 chain passes the
parenthesized form through verbatim. On RHEL/Alma/Rocky 10 the webkitgtk6.0
package comes from EPEL, which becomes an install prerequisite for the UI.

The wails3 packaging config (client/ui/build/linux/nfpm/nfpm.yaml, local
dev packaging only) is kept in sync.

.goreleaser_ui.yaml

@@ -88,6 +88,8 @@ nfpms:
         dst: /usr/share/pixmaps/netbird.png
     dependencies:
       - netbird
+      - libgtk-4-1 (>= 4.14)
+      - libwebkitgtk-6.0-4
 
   - maintainer: Netbird <dev@netbird.io>
     description: Netbird client UI.
@@ -109,6 +111,8 @@ nfpms:
         dst: /usr/share/pixmaps/netbird.png
     dependencies:
       - netbird
+      - (gtk4 >= 4.14 or libgtk-4-1 >= 4.14)
+      - (webkitgtk6.0 or libwebkitgtk-6_0-4)
 
     rpm:
       signature:

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

@@ -26,17 +26,17 @@ contents:
 
 # Default dependencies for the GTK4 + WebKitGTK 6.0 stack (Ubuntu 24.04+ / Debian 13+)
 depends:
-  - libgtk-4-1
+  - libgtk-4-1 (>= 4.14)
   - libwebkitgtk-6.0-4
   - xdg-utils
 
 # Distribution-specific overrides for different package formats
 overrides:
-  # RPM packages for Fedora / RHEL / AlmaLinux / Rocky Linux
+  # RPM packages for Fedora / RHEL / AlmaLinux / Rocky Linux / openSUSE
   rpm:
     depends:
-      - gtk4
-      - webkitgtk6.0
+      - (gtk4 >= 4.14 or libgtk-4-1 >= 4.14)
+      - (webkitgtk6.0 or libwebkitgtk-6_0-4)
       - xdg-utils
 
   # Arch Linux packages