fix(fileflows): install .NET 10 ASP.NET Core Runtime to match current release (#15702)

* fix(fileflows): install .NET 10 ASP.NET Core Runtime to match current release

FileFlows now ships its server/node binaries targeting .NET 10
(Microsoft.NETCore.App 10.0.0), but the install script still installs the
ASP.NET Core Runtime 8.0. On a fresh install the app therefore cannot start:

  You must install or update .NET to run this application.
  Framework: 'Microsoft.NETCore.App', version '10.0.0' (x64)
  The following frameworks were found:
    8.0.28 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]

so "dotnet FileFlows.Server.dll --systemd install" fails with exit code 150
(service failed to start) and the container aborts (issue #15686).

Bump the runtime to 10.0 on both branches: aspnetcore-runtime-10.0 from
packages.microsoft.com on amd64 (the same repo and package already used by
igotify, rdtclient and technitiumdns) and dotnet-install --channel 10.0 on
arm64.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(fileflows): ensure current .NET runtime on update too

An existing install set up under an older .NET (e.g. aspnetcore-runtime-8.0)
would download a newer FileFlows on update but keep the old runtime, failing to
start with the same framework-not-found error. Mirror the runtime handling used
by technitiumdns/rdtclient in update_script.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

install/fileflows-install.sh

@@ -26,8 +26,8 @@ msg_info "Installing ASP.NET Core Runtime"
 if [[ "$(arch_resolve)" == "arm64" ]]; then
   # packages.microsoft.com only ships amd64 debs for Debian; use dotnet-install on arm64
   curl -fsSL https://dot.net/v1/dotnet-install.sh -o /tmp/dotnet-install.sh
-  $STD bash /tmp/dotnet-install.sh --channel 8.0 --runtime aspnetcore --install-dir /usr/lib/dotnet8
-  ln -sf /usr/lib/dotnet8/dotnet /usr/bin/dotnet
+  $STD bash /tmp/dotnet-install.sh --channel 10.0 --runtime aspnetcore --install-dir /usr/lib/dotnet10
+  ln -sf /usr/lib/dotnet10/dotnet /usr/bin/dotnet
   rm -f /tmp/dotnet-install.sh
 else
   setup_deb822_repo \
@@ -35,7 +35,7 @@ else
     "https://packages.microsoft.com/keys/microsoft-2025.asc" \
     "https://packages.microsoft.com/debian/13/prod/" \
     "trixie"
-  $STD apt install -y aspnetcore-runtime-8.0
+  $STD apt install -y aspnetcore-runtime-10.0
 fi
 msg_ok "Installed ASP.NET Core Runtime"