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/routes.go

@@ -29,6 +29,10 @@ func (s *Server) routes(mux *http.ServeMux) {
 	mux.HandleFunc("GET /registry", s.handleRegistryPage)
 	mux.HandleFunc("GET /registry/{ip}", s.handleRegistryDetail)
 
+	mux.HandleFunc("GET /analytics", s.handleAnalyticsPage)
+	mux.HandleFunc("GET /analytics/lists/{kind}", s.handleAnalyticsList)
+	mux.HandleFunc("GET /analytics/csv/{kind}", s.handleAnalyticsCSV)
+
 	mux.HandleFunc("GET /validators", s.handleValidatorsPage)
 	mux.HandleFunc("POST /validators", s.handleValidatorCreate)
 	mux.HandleFunc("PUT /validators/{id}", s.handleValidatorUpdate)
@@ -52,6 +56,7 @@ func (s *Server) routes(mux *http.ServeMux) {
 	mux.HandleFunc("GET /settings", s.handleSettingsPage)
 	mux.HandleFunc("PUT /settings", s.handleSettingsPut)
 	mux.HandleFunc("PUT /settings/inbound-checks", s.handleInboundChecksPut)
+	mux.HandleFunc("PUT /settings/subnets", s.handleSubnetsPut)
 	mux.HandleFunc("PUT /settings/auto-cycle", s.handleAutoCyclePut)
 	mux.HandleFunc("POST /settings/auto-cycle/start", s.handleAutoCycleStart)
 	mux.HandleFunc("POST /settings/auto-cycle/stop", s.handleAutoCycleStop)