Add signon plugins and fix sonic-frameworks-sso devel files

Build signon-plugin-oauth2 (0.25 git snapshot) and
signon-kwallet-extension (26.04.3) for SonicDE, linking against
sonic-frameworks-sso and sonic-frameworks-keyring.

Update sonic-frameworks-sso to release 9: install plugin development
files (headers, pkgconfig, symlinks, CamelCase forwarding headers)
that the CMake fork doesn't install, needed to build signon plugins.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

signon-plugin-oauth2/signon-plugin-oauth2.spec

@@ -0,0 +1,60 @@
+%global gitdate 20231216
+%global commit0 fab698862466994a8fdc9aa335c87b4f05430ce6
+%global shortcommit0 %(c=%{commit0}; echo ${c:0:7})
+
+Name:           signon-plugin-oauth2
+Version:        0.25^%{gitdate}.%{shortcommit0}
+Release:        1%{?dist}
+Summary:        OAuth2 plugin for the Accounts framework
+
+License:        LGPL-2.1-or-later
+URL:            https://gitlab.com/accounts-sso/signon-plugin-oauth2
+
+Source0:        https://gitlab.com/accounts-sso/signon-plugin-oauth2/-/archive/%{commit0}/%{name}-%{commit0}.tar.gz
+
+BuildRequires: make
+BuildRequires:  qt6-qtbase-devel
+BuildRequires:  sonic-frameworks-sso-devel
+BuildRequires:  doxygen
+BuildRequires:  graphviz
+BuildRequires:  libproxy-devel
+
+%description
+%{summary}.
+
+%package        devel
+Summary:        Development files for %{name}
+Requires:       %{name}%{?_isa} = %{version}-%{release}
+%description devel
+%{summary}.
+
+%prep
+%autosetup -n %{name}-%{commit0} -p1
+
+%build
+%qmake_qt6 \
+    QMF_INSTALL_ROOT=%{_prefix} \
+    CONFIG+=release \
+    CONFIG+=nomake_tests \
+    LIBDIR=%{?_libdir} \
+    signon-oauth2.pro
+
+%make_build
+
+%install
+%make_install INSTALL_ROOT=%{buildroot}
+
+# Delete examples (if built)
+rm -fv %{buildroot}/%{_bindir}/oauthclient 2>/dev/null || true
+rm -rvf %{buildroot}/%{_sysconfdir} 2>/dev/null || true
+
+%files
+%{_libdir}/signond/liboauth2plugin.so
+
+%files devel
+%{_includedir}/signon-plugins/*.h
+%{_libdir}/pkgconfig/signon-oauth2plugin.pc
+
+%changelog
+* Fri Aug 28 2026 SonicDE <dev@sonicde.org> - 0.25^20231216.fab6988-1
+- Build for SonicDE, link against sonic-frameworks-sso