docs(us2): Soft Serve → Gitea 迁移事实与参考镜像 (Plane VPS-94)

- hosts/us2: Gitea 1.27.3-rootless 部署实况 (repo.windy.me SSH:2222/Web), 16 仓迁移核对, 备份/回滚; soft-serve 停用保留作回滚
- compose/gitea: 参考镜像 (rootless compose + 备份 sidecar + 一次性迁移脚本留档)
- AGENTS/inventory/compose README: 服务表与索引同步

compose/gitea/scripts/backup.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -eu
+umask 077
+D() { date "+%Y-%m-%d %H:%M:%S"; }
+TS=$(date +%Y%m%d_%H%M%S)
+OUT="/backup/gitea_${TS}"
+mkdir -p "$OUT"
+echo "[$(D)] Starting gitea backup -> $OUT"
+# rootless 布局: app.ini=/etc/gitea(宿主 ./config), db+repos=/var/lib/gitea/data(宿主 ./data/data)
+# app.ini 含 SECRET_KEY/INTERNAL_TOKEN — 恢复 2FA/session/mirror 凭据必需
+tar czf "$OUT/app.ini.tar.gz" -C /config app.ini
+sqlite3 /data/data/gitea.db ".backup '$OUT/gitea.db'"
+rsync -a /data/data/git/repositories/ "$OUT/repos/"
+tar czf "$OUT/repos.tar.gz" -C "$OUT" repos
+rm -rf "$OUT/repos"
+chmod 600 "$OUT"/*
+if [ -n "${BACKUP_UID:-}" ] && [ -n "${BACKUP_GID:-}" ]; then
+  chown -R "$BACKUP_UID:$BACKUP_GID" "$OUT" /backup/backup.log
+fi
+echo "[$(D)] Backup OK: $(du -sh "$OUT" | cut -f1)"