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/handlers_settings.go

@@ -14,6 +14,8 @@ type settingsPageData struct {
 	Inbound  inboundChecksDTO
 	// AutoCycle is the automatic-check-cycle panel's status/parameters.
 	AutoCycle autoCycleDTO
+	// Subnets is the list the analytics page groups addresses by.
+	Subnets subnetList
 }
 
 func (s *Server) handleSettingsPage(w http.ResponseWriter, r *http.Request) {
@@ -26,7 +28,11 @@ func (s *Server) handleSettingsPage(w http.ResponseWriter, r *http.Request) {
 	if err == nil {
 		err = autoCycleErr
 	}
-	data := settingsPageData{Settings: settings, Inbound: inbound, AutoCycle: autoCycle}
+	subnets, subnetsErr := s.CA.GetSubnets(r.Context())
+	if err == nil {
+		err = subnetsErr
+	}
+	data := settingsPageData{Settings: settings, Inbound: inbound, AutoCycle: autoCycle, Subnets: subnets}
 	data.ActiveNav = "settings"
 	data.Banner = bannerFor(err)
 	s.renderPage(w, r, "settings_page", data)
@@ -49,7 +55,11 @@ func (s *Server) renderSettingsForm(w http.ResponseWriter, r *http.Request, acti
 	if actionErr == nil {
 		actionErr = autoCycleErr
 	}
-	s.renderFragment(w, "settings_form", settingsPageData{Settings: settings, Inbound: inbound, AutoCycle: autoCycle}, actionErr)
+	subnets, subnetsErr := s.CA.GetSubnets(r.Context())
+	if actionErr == nil {
+		actionErr = subnetsErr
+	}
+	s.renderFragment(w, "settings_form", settingsPageData{Settings: settings, Inbound: inbound, AutoCycle: autoCycle, Subnets: subnets}, actionErr)
 }
 
 func (s *Server) handleSettingsPut(w http.ResponseWriter, r *http.Request) {
@@ -102,6 +112,26 @@ func (s *Server) handleInboundChecksPut(w http.ResponseWriter, r *http.Request)
 	s.renderSettingsForm(w, r, err)
 }
 
+// handleSubnetsPut saves the subnet list from the textarea of /settings: one
+// subnet per line, CIDR first and an optional label after a space.
+func (s *Server) handleSubnetsPut(w http.ResponseWriter, r *http.Request) {
+	if err := r.ParseForm(); err != nil {
+		s.renderSettingsForm(w, r, fmt.Errorf("invalid form: %w", err))
+		return
+	}
+	list := subnetList{Subnets: []subnetEntry{}}
+	for _, line := range strings.Split(r.PostFormValue("subnets"), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		cidr, label, _ := strings.Cut(line, " ")
+		list.Subnets = append(list.Subnets, subnetEntry{CIDR: strings.TrimSpace(cidr), Label: strings.TrimSpace(label)})
+	}
+	_, err := s.CA.PutSubnets(r.Context(), list)
+	s.renderSettingsForm(w, r, err)
+}
+
 // parseMinutes converts a form field holding a (possibly fractional) number
 // of minutes into whole seconds.
 func parseMinutes(raw string) (int, error) {