fix(ci): require all 4 host keys before overwriting ssh-mcp-key secret

When ssh-keyscan partially fails (e.g. one host is unreachable for a
moment) the previous logic still considered the file non-empty, so it
patched ssh-mcp-key/known_hosts with an incomplete set. asyncssh then
rejected any SSH to the missing host with "Host key is not trusted",
which routed every host disk-full / docker alert into the emergency
escalation channel and spammed Telegram (today's regression for 110).

Now we explicitly verify all four target IPs (110/120/121/188) appear
in the scan output before patching. Missing any of them aborts the
patch and keeps the previously-good secret untouched, plus logs the
ssh-keyscan stderr to help debug intermittent network issues.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/cd.yaml

@@ -566,8 +566,22 @@ jobs:
           # asyncssh reads /etc/ssh-mcp/known_hosts and requires a non-empty
           # OpenSSH known_hosts file. Keep hosts unhashed so both asyncssh and
           # CLI diagnostics can trust the same secret.
-          ssh-keyscan 192.168.0.110 192.168.0.120 192.168.0.121 192.168.0.188 > /tmp/known_hosts_repair 2>/dev/null
-          if [ -s /tmp/known_hosts_repair ]; then
+          # 2026-05-02 ogt + Claude Sonnet 4.6: 加 4 台主機完整性檢查
+          # 根因：partial scan（如 110 timeout、其他成功）會讓 [-s file] 通過、
+          #       後續 patch 推進缺漏的 known_hosts → asyncssh 拒所有 SSH。
+          # 修法：scan 完用 grep -c 驗證 4 台主機都在；缺任何一台就 abort，
+          #       不能覆蓋現有 secret，防止 production SSH 自動修復路徑癱瘓。
+          ssh-keyscan 192.168.0.110 192.168.0.120 192.168.0.121 192.168.0.188 > /tmp/known_hosts_repair 2>/tmp/known_hosts_scan_err || true
+          EXPECTED_HOSTS=4
+          PRESENT=0
+          for ip in 192.168.0.110 192.168.0.120 192.168.0.121 192.168.0.188; do
+            if grep -qE "^${ip}[[:space:]]" /tmp/known_hosts_repair 2>/dev/null; then
+              PRESENT=$((PRESENT + 1))
+            else
+              echo "⚠️ ssh-keyscan 缺主機 ${ip}"
+            fi
+          done
+          if [ "$PRESENT" -eq "$EXPECTED_HOSTS" ]; then
             sudo kubectl create secret generic awoooi-repair-known-hosts \
               -n awoooi-prod \
               --from-file=known_hosts=/tmp/known_hosts_repair \
@@ -576,11 +590,13 @@ jobs:
               || echo "⚠️ awoooi-repair-known-hosts Secret 建立失敗 (非致命)"
             sudo kubectl patch secret ssh-mcp-key -n awoooi-prod --type=merge \
               -p='{"data":{"known_hosts":"'$(base64 -w 0 /tmp/known_hosts_repair)'"}}' \
-              && echo "✅ ssh-mcp-key known_hosts 已更新" \
+              && echo "✅ ssh-mcp-key known_hosts 已更新（4 台主機完整）" \
               || echo "⚠️ ssh-mcp-key known_hosts 更新失敗 (非致命)"
-            rm -f /tmp/known_hosts_repair
+            rm -f /tmp/known_hosts_repair /tmp/known_hosts_scan_err
           else
-            echo "⚠️ ssh-keyscan 掃描失敗，跳過 known_hosts Secret"
+            echo "❌ ssh-keyscan 只抓到 ${PRESENT}/${EXPECTED_HOSTS} 台主機，跳過 patch（保留現有 secret）"
+            cat /tmp/known_hosts_scan_err 2>/dev/null | head -10
+            rm -f /tmp/known_hosts_repair /tmp/known_hosts_scan_err
           fi
 
           echo "✅ 所有 Secrets 注入完成"