feat: git-based agent version reference and unified outdated badge (0.20.0)

SAC reads latest RDP/ssh-monitor versions from configured git repos for outdated detection, update targets, and settings test-git.

tools/test_sac_agent_git.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+TMP=$(mktemp -d)
+trap 'rm -rf "$TMP"' EXIT
+git clone --depth 1 -q https://git.kalinamall.ru/PapaTramp/RDP-login-monitor.git "$TMP/rdp"
+git clone --depth 1 -q https://git.kalinamall.ru/PapaTramp/ssh-monitor.git "$TMP/ssh"
+echo RDP_version_txt:
+cat "$TMP/rdp/version.txt" 2>/dev/null || echo missing
+echo RDP_script:
+grep -m1 ScriptVersion "$TMP/rdp/Login_Monitor.ps1" 2>/dev/null || echo missing
+echo SSH_version:
+grep -m1 '^SSH_MONITOR_VERSION=' "$TMP/ssh/ssh-monitor" 2>/dev/null || cat "$TMP/ssh/version.txt" 2>/dev/null || echo missing