feat: migrate to Gitea, productize Helm chart, unify version

- CI: replace GitLab pipeline with Gitea Actions (.gitea/workflows/release.yaml);
  publish .deb/image/hosted/chart to Gitea registries; gate image+hosted on .deb
  (needs + registry pre-check)
- drop connectone/Nexus; apt now from the Gitea Debian registry
- single version source (/VERSION=3.2.8); CI enforces .env/Chart consistency
- restructure: build/->packaging/deb, root Dockerfile->packaging/image,
  hosted/->packaging/hosted, .kube/->charts/freeradius
- Helm chart: documented values, DB password via Secret/$ENV, configurable
  scheduling/persistence; remove plaintext creds and hostPath PV
- gitignore *.env_cnf; docs for hosted (RU)/helm/root + agent KB sync

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packaging/hosted/config/systemd/freeradius.service

@@ -0,0 +1,74 @@
+[Unit]
+Description=FreeRADIUS multi-protocol policy server
+After=network-online.target
+Documentation=man:radiusd(8) man:radiusd.conf(5) http://wiki.freeradius.org/ http://networkradius.com/doc/
+
+[Service]
+Type=notify
+WatchdogSec=60
+NotifyAccess=all
+PIDFile=/etc/freeradius/freeradius.pid
+EnvironmentFile=-/etc/default/freeradius
+
+# FreeRADIUS can do static evaluation of policy language rules based
+# on environmental variables which is very useful for doing per-host
+# customization.
+# Unfortunately systemd does not allow variable substitutions such
+# as %H or $(hostname) in the EnvironmentFile.
+# We provide HOSTNAME here for convenience.
+Environment=HOSTNAME=%H
+Environment=TZ=UTC
+
+# Limit memory to 2G this is fine for %99.99 of deployments.  FreeRADIUS
+# is not memory hungry, if it's using more than this, then there's probably
+# a leak somewhere.
+MemoryLimit=2G
+
+# Ensure the daemon can still write its pidfile after it drops
+# privileges. Combination of options that work on a variety of
+# systems. Test very carefully if you alter these lines.
+RuntimeDirectory=freeradius
+RuntimeDirectoryMode=0775
+# This does not work on Debian Jessie:
+User=freerad
+Group=freerad
+# This does not work on Ubuntu Bionic:
+ExecStartPre=/bin/chown freerad:freerad /var/run/freeradius
+
+ExecStartPre=/usr/sbin/freeradius $FREERADIUS_OPTIONS -Cx -lstdout
+ExecStart=/usr/sbin/freeradius -f $FREERADIUS_OPTIONS
+Restart=on-failure
+RestartSec=3
+ExecReload=/usr/sbin/freeradius $FREERADIUS_OPTIONS -Cxm -lstdout
+ExecReload=/bin/kill -HUP $MAINPID
+
+#  Don't elevate privileges after starting
+NoNewPrivileges=true
+
+# Allow binding to secure ports, broadcast addresses, and raw interfaces.
+#CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SETUID CAP_SETGID CAP_CHOWN CAP_DAC_OVERRIDE
+
+# Private /tmp that isn't shared by other processes
+PrivateTmp=true
+
+# cgroups are readable only by radiusd, and child processes
+ProtectControlGroups=true
+
+# don't load new kernel modules
+ProtectKernelModules=true
+
+# don't tune kernel parameters
+ProtectKernelTunables=true
+
+# Only allow native system calls
+SystemCallArchitectures=native
+
+# We shouldn't be writing to the configuration directory
+ReadOnlyDirectories=/etc/freeradius/
+
+# We can read and write to the log directory.
+ReadWriteDirectories=/var/log/freeradius/
+
+[Install]
+WantedBy=multi-user.target
+