Fix #1313: hydrate Map / Players cells on admin Server Management list

[rumblefrog]

Summary

Fixes #1313.

The admin Server Management list (?p=admin&c=servers&section=list)
shipped placeholder Map / Players cells with data-hydrate="..."
attributes that nothing read, so the values stayed at the em-dash
forever. The public Server List (?p=servers) had the same card
shape plus an inline <script> that drove Actions.ServersHostPlayers
and patched the cells, but the admin surface never picked up the call
site (#1313 audit).

This PR extracts the public list's hydration loop into a shared
helper at web/scripts/server-tile-hydrate.js and pulls it from
both templates. The helper auto-runs on first paint for any
container marked data-server-hydrate=\"auto\", walks
[data-testid=\"server-tile\"] children, fires
Actions.ServersHostPlayers per tile, and patches the live cells
(status pill, map, players, hostname, players bar, plus the
public-only player-list panel — feature-detected per tile).

The admin tile picks up the canonical testids the public tile uses
(server-status / server-map / server-players / server-host)
plus a status pill with loading / online / offline states and a
refresh button per enabled row. Disabled tiles carry
data-server-skip=\"1\" so the helper leaves them at the
server-rendered placeholder — no point poking a UDP socket for a
server the panel just told you is disabled by config.

Files

• web/scripts/server-tile-hydrate.js — new shared helper, vanilla
  JS + // @ts-check. Exposed as window.SBPP.hydrateServerTiles.
• web/scripts/globals.d.ts — typed declaration for the new
  window.SBPP.hydrateServerTiles entry point.
• web/themes/default/page_servers.tpl — replaced the inline
  hydration loop with the shared <script src=\"...server-tile-hydrate.js\">.
• web/themes/default/page_admin_servers_list.tpl — added the
  status pill, hostname target, refresh button, data-status=\"loading\"
  / data-server-skip=\"1\" markers, and the script include.
  Renamed the legacy data-hydrate=\"map|players\" placeholders to
  the canonical data-testid=\"server-{map,players}\" testids.
• web/tests/integration/AdminServersListHydrationTest.php — locks
  the per-tile markup contract (testids, script include,
  data-server-skip shape on disabled tiles, absence of the legacy
  data-hydrate= placeholders).
• web/tests/e2e/specs/smoke/admin/servers.spec.ts +
  web/tests/e2e/pages/admin/AdminServers.ts — pins the page mount,
  the script wiring, and the axe-critical=0 a11y gate on the admin
  route.
• AGENTS.md — added an anti-pattern entry (inert
  data-hydrate=\"...\" placeholders without the helper include)
  and a Where-to-find-what row pointing at the new helper.
• ARCHITECTURE.md — added a server-tile-hydrate.js row to the
  Frontend JavaScript table.

Test plan

• ./sbpp.sh phpstan — 4 errors, all baseline (matches
  origin/main after --generate-baseline=phpstan-baseline.neon).
  My changes add 0 new errors.
• ./sbpp.sh test — 409 tests pass, including the 6 new
  AdminServersListHydrationTest cases.
• ./sbpp.sh ts-check — clean.
• ./sbpp.sh composer api-contract — no diff (the API handler
  api_servers_host_players was untouched).
• ./sbpp.sh e2e --grep \"servers\" — all 10 servers-related e2e
  tests pass (chromium + mobile-chromium), including the new
  smoke /admin/servers spec.
• ./sbpp.sh e2e --grep \"smoke\" — all 60 smoke specs pass; no
  regressions on the public servers list, dashboard, comms,
  protests, login, etc.

[rumblefrog]

Heads-up from #1326 review: that PR (now ready to merge) restores the <img data-testid="server-map-img"> slot inside [data-testid="server-players-panel"] in page_servers.tpl, plus the inline applyData patch that wires r.data.mapimg into src and toggles hidden on load / error (#1312).

When you rebase this branch, the extracted web/scripts/server-tile-hydrate.js will need to absorb that wiring or the public servers page silently loses the thumbnail again. The PHPUnit guard at web/tests/integration/ServerMapImageRenderTest.php will fail your build if the inline initializer drops the tile.querySelector('[data-testid="server-map-img"]') lookup, and the e2e spec at web/tests/e2e/specs/flows/server-map-thumbnail.spec.ts pins the runtime behaviour. Worth adding equivalent hydration coverage to the helper for both the public and admin surfaces while you're touching the file.