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/httpapi/handlers_registry.go

@@ -2,6 +2,7 @@ package httpapi
 
 import (
 	"net/http"
+	"net/netip"
 	"strconv"
 	"strings"
 
@@ -22,7 +23,21 @@ func (s *Server) handleAdminRegistry(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, err.Error())
 		return
 	}
-	filter := db.RegistryFilter{Query: strings.TrimSpace(q.Get("q")), LastResult: q.Get("last_result")}
+	filter := db.RegistryFilter{Query: strings.TrimSpace(q.Get("q")), LastResult: q.Get("last_result"), Subnet: strings.TrimSpace(q.Get("subnet"))}
+	if filter.Subnet != "" {
+		if _, err := netip.ParsePrefix(filter.Subnet); err != nil {
+			writeError(w, http.StatusBadRequest, "invalid subnet "+strconv.Quote(filter.Subnet)+" (a CIDR such as 203.0.113.0/24 is expected)")
+			return
+		}
+	}
+	if v := q.Get("run"); v != "" {
+		id, err := strconv.ParseInt(v, 10, 64)
+		if err != nil || id <= 0 {
+			writeError(w, http.StatusBadRequest, "invalid run "+strconv.Quote(v))
+			return
+		}
+		filter.RunID = id
+	}
 	if filter.LastResult != "" && !db.IsValidResult(filter.LastResult) {
 		writeError(w, http.StatusBadRequest, "invalid last_result "+strconv.Quote(filter.LastResult)+" (valid: pass, partial, fail, cancelled)")
 		return