Add the Analytics section: check runs, analytics API and page

Runs (migration 0011): a run groups the cycles of one launch. It opens when an
address enters an idle queue, takes everything submitted or re-checked while it
is open and is finalized when all its addresses are done; a re-check after that
opens a new run, so results of different runs never mix. check_runs,
run_results (one result per address and run, with the verdict and the expected
and stored check counts), subnets, run_id on ip_queue and checks. Existing data
is split into runs at pauses of more than an hour; ingress checks get the
validator that held the address (also at write time from now on).

Analytics (internal/analytics): figures computed from the stored checks of the
latest cycle of each address in the run, as facts next to the verdict: summary,
reasons of partial, data quality, subnets, targets and the subnet x target
matrix by check type, ingress by site, error classes, validators, and the
address lists behind the indicators and error classes. API: analytics runs,
report, lists (JSON or CSV), subnet list; run and subnet filters for the
registry.

Dashboard: /analytics matching the approved mockup (run selector, indicators
with address lists and CSV, error-class dialogs, drill-down to the registry),
subnet list on /settings. Sidebar: the control-api link state, theme toggle and
logout moved to the top, the three dots next to the logo removed, sections
grouped.

Rebuilt bin/control-api and bin/admin-dashboard to match. Plan, summary and the
updated README, API, USAGE, DASHBOARD and ADMIN_CLEANUP docs are in docs/.

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

internal/dashboard/templates/settings.html

@@ -117,4 +117,23 @@ inbound-проверки к нулю, не трогая список площа
 </form>
 </div>
 </div>
+
+<div class="panel">
+<div class="panel-body">
+<p class="muted" style="margin-bottom:16px">Подсети для страницы <a href="/analytics">«Аналитика»</a>: по ним
+группируются адреса запуска. По одной в строке — <code>CIDR</code> и, через пробел, необязательная подпись
+(<code>83.166.248.0/21 москва</code>). Адрес относится к самой узкой подходящей подсети, остальные идут в строку
+«прочие». Пока список пуст, адреса группируются по /24.</p>
+<form hx-put="/settings/subnets" hx-target="#settings-form-wrap" hx-swap="innerHTML">
+<div class="field">
+<label for="subnets_text">Подсети</label>
+<textarea id="subnets_text" name="subnets" rows="8" spellcheck="false" placeholder="83.166.248.0/21&#10;212.233.72.0/21 подпись">{{range .Subnets.Subnets}}{{.CIDR}}{{if .Label}} {{.Label}}{{end}}
+{{end}}</textarea>
+</div>
+<div class="field-row">
+<button type="submit" class="btn btn-primary">Сохранить</button>
+</div>
+</form>
+</div>
+</div>
 {{end}}