v1.1.0

Minor release headlined by one-click remote node upgrades from the panel,
capping off the plan-model / performance / correctness work of the 1.0.x line.

Added

• One-click node upgrade. The Node Status page shows a per-node upgrade
  action (active when a node is behind the panel version). Clicking it directs
  that node to self-update: it downloads the panel's exact version from the
  official GitHub release for its architecture, verifies the published sha256,
  backs up its current binary, atomically swaps, and restarts (systemd). Safety:
  • The command carries no URL/binary — the node only pulls the official release
    and verifies the hash, so it can never be made to run arbitrary code.
  • Upgrade-only: the target must be a valid semver strictly newer than the
    running version, so a compromised panel can't force a downgrade to an old,
    vulnerable build.
  • Install-aware: only systemd nodes self-upgrade; docker nodes show
    "update the image", and manual runs are disabled (nothing would restart
    them). Nodes report their install method for this.
  • Single-flight + mandatory backup, so repeated clicks can't corrupt the
    binary and a failed backup aborts the swap.
• Node binaries continue to ship for both amd64 and arm64 (static musl).

Fixed

• The default "free" plan no longer reappears in the shop after every panel
  update. It is now seeded only on a fresh (empty) database, so an admin who
  deletes it (once other plans exist) won't see it come back on restart.
• Shop plan cards no longer render ragged when a plan grants no lines — the
  "granted lines" row now shows "无 / None" so all cards stay aligned.