Scan floating IPs in the background, page by page, so thousands of addresses work

The "Scan Floating IP" button failed with a client timeout: the project now
holds ~6.4k floating IPs and the scan listed them all in one unpaginated,
timeout-less Neutron request on the HTTP request context.

openstack: ListFreeFloatingIPs reads marker-based pages (fields= keeps them
small) with per-page retry/backoff on transport errors, 5xx and 429, and every
request now has a timeout (also ends hangs inside the orchestrator tick).

orchestrator: the scan is a single-flight background job on the process
context with progress (clearing/listing/enqueuing/done/error), dry_run, full
discovery before anything is enqueued, then SubmitIPs in chunks of 500 in
ascending IP order; a failed read leaves the queue untouched. The auto-cycle
gets a "scanning" phase that polls the job, so the control loop and
autoCycleMu are never held across OpenStack/DB work; it recovers after a
restart and waits for (instead of adopting) a scan started by someone else.

db: migration 0009 (indexes), paged ListIPsPage/ListRegistryPage, GROUP BY
counters, EXISTS completion check, set-based ClearAllIPs.

API: POST /admin/ips/scan -> 202 (dry_run, wait), GET /admin/ips/scan, paging
and filters on /admin/ips and /admin/registry (bare arrays without limit),
results_by_overall in /admin/status.

dashboard: scan progress panel and dry-run button, paginated /ips and
/registry with server-side filters, Overview on counters and capped lists
with progress/ETA, "select all N by filter", hx-params fix for per-row
buttons, real counts in confirmations.

Also: docs (API, USAGE, DASHBOARD, README), plan and review under
docs/changes/, bin/ rebuilt with new SHA256SUMS.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/dashboard/templates/overview_fragment.html

@@ -6,6 +6,18 @@
 <div class="stat-card{{if eq $state "failed"}} bad{{else if eq $state "checking"}} accented{{end}}"><span class="value">{{$count}}</span><span class="label">{{$state}}</span></div>
 {{end}}
 </div>
+{{if .Progress.Total}}
+<div class="overall-progress" id="overview-progress">
+<p>Готово {{.Progress.Done}} из {{.Progress.Total}} ({{.Progress.Percent}}%) · в работе {{.Progress.Active}} · в очереди {{.Progress.Queued}}{{if .Progress.ETA}} · осталось ≈ {{.Progress.ETA}}{{end}}</p>
+<progress max="{{.Progress.Total}}" value="{{.Progress.Done}}" aria-label="Готово"></progress>
+</div>
+{{end}}
+{{with .Status.ResultsByOverall}}{{if or (index . "pass") (index . "partial") (index . "fail") (index . "cancelled")}}
+<p class="muted" id="overview-results" style="margin-top:8px">Итоги проверок: pass {{index . "pass"}} · partial {{index . "partial"}} · fail {{index . "fail"}} · cancelled {{index . "cancelled"}}</p>
+{{end}}{{end}}
+{{with .Scan}}
+<p class="muted" id="overview-scan" style="margin-top:8px">Сканирование: {{.StateLabel}}{{if .DryRun}} (пробное){{end}} · прочитано страниц {{.Pages}}, найдено адресов {{.Discovered}}, свободных {{.Free}}{{if .Handled}}, обработано {{.Handled}}{{end}} · <a href="/ips">подробнее</a></p>
+{{end}}
 {{with .AutoCycle}}{{if .Enabled}}
 <p class="muted" id="overview-auto-cycle" style="margin-top:12px"><span class="pill pill-info">Автоцикл активен</span> · {{.PhaseLabel}} · следующий запуск: {{fmtTime .NextRunAt}}</p>
 {{end}}{{end}}
@@ -20,14 +32,14 @@
 {{define "overview_stats_oob"}}<div id="overview-stats" hx-swap-oob="true">{{template "overview_stats" .}}</div>{{end}}
 
 {{define "overview_tables"}}
-<h2 class="section-title">Текущая проверка</h2>
-{{if .CurrentItems}}
+<h2 class="section-title">В работе</h2>
+{{if .ActiveItems}}
 <div class="panel">
 <div class="table-scroll">
 <table>
 <thead><tr><th>Адрес</th><th>Состояние</th><th>Валидатор</th><th>Попытка</th><th>Назначено</th></tr></thead>
 <tbody>
-{{range .CurrentItems}}
+{{range .ActiveItems}}
 {{$b := ipBadge .State .OverallResult .FIPAssociatedAt 0}}
 <tr>
 <td class="addr" data-label="Адрес"><a href="/ips/{{.IPAddress}}">{{.IPAddress}}</a></td>
@@ -41,11 +53,35 @@
 </table>
 </div>
 </div>
+{{if gt .ActiveTotal (len .ActiveItems)}}<p class="muted">Показано {{len .ActiveItems}} из {{.ActiveTotal}} · <a href="/ips?state=active{{if .Query}}&amp;q={{.Query}}{{end}}">все в работе</a></p>{{end}}
 {{else}}
 {{if or .Query .StatusFilter}}<p class="muted">Ничего не найдено по текущему фильтру.</p>
 {{else}}<p class="muted">Сейчас нет адресов в обработке.</p>{{end}}
 {{end}}
 
+{{if not .StatusFilter}}
+<p class="queue-line">В очереди: <b>{{.QueuedTotal}}</b> · <a href="/ips?state=queued{{if .Query}}&amp;q={{.Query}}{{end}}">открыть весь список</a></p>
+{{if .QueuedItems}}
+<div class="panel">
+<div class="table-scroll">
+<table class="compact">
+<thead><tr><th>Ближайшие в очереди</th><th>Состояние</th></tr></thead>
+<tbody>
+{{range .QueuedItems}}
+{{$b := ipBadge .State .OverallResult .FIPAssociatedAt 0}}
+<tr>
+<td class="addr" data-label="Адрес"><a href="/ips/{{.IPAddress}}">{{.IPAddress}}</a></td>
+<td data-label="Состояние"><span class="pill {{$b.Class}}">{{$b.Label}}</span></td>
+</tr>
+{{end}}
+</tbody>
+</table>
+</div>
+</div>
+{{if gt .QueuedTotal (len .QueuedItems)}}<p class="muted">Показаны ближайшие {{len .QueuedItems}} из {{.QueuedTotal}}.</p>{{end}}
+{{end}}
+{{end}}
+
 <h2 class="section-title">Последние {{.LastN}} завершённых</h2>
 <div class="breakdown">
 <span>pass <b>{{index .Breakdown "pass"}}</b></span>