Admin dashboard: pages, Lane observability, poll pass log, per-Series intervention (#134) (#148)

Spec #134, all ten tickets. Closes #134.

## What ships

The admin surface becomes four bookmarkable addresses behind one nav row, and Lane observability stops dying with the process.

- **#138** `/admin` splits into Overview, Lanes, Readers, Series, each a real route with the active tab underlined.
- **#139** `poll_passes` and `poll_lanes` land as durable tables with their store surface.
- **#140** cross-Series admin read model, with the privacy boundary in the projection: the Reader id that raised a Latest Chapter never leaves the store package.
- **#141** the poller records exactly one pass row per exit, with a skip reason and outcome counts.
- **#142** Series list: eight hygiene filters, Site and Library narrowing, paging — all of it in the query string, so a filtered list is a bookmark.
- **#143** Overview: a three-state verdict line and a stats block where every non-zero figure links to the list that counts it.
- **#144** per-Series detail page, keyed by the `site:series_id` composite the rest of the system already uses.
- **#145** the Lanes page reads the database; the in-memory Lane state, `web.LaneReporter` and `latest.Status` are deleted.
- **#146** Forced Poll: *Check now* stamps `series.force_poll_at` and never commands the poller.
- **#147** pause and resume one Site's Lane, with a mandatory 1h/6h/24h expiry.

## Shape of the design

Two decisions carry the rest. **Commands go through the database, never at the poller**: both *Check now* and a Lane pause write a row the next pass reads, so they survive a restart and the whole surface stays testable with no poller running. And **pending is derived, never stored** — the request stamp being newer than the check stamp — which self-clears on the check stamp with no second write and no sweeper, because the check stamp is written before the fetch.

ADRs: `docs/adr/0012-persisted-lane-state.md`, `docs/adr/0013-commands-through-the-database.md`.

## Verification

`go test ./...` green on the merged base (`264839e`), all packages, Docker-backed. `gofmt -l` and `go vet` clean.

Every ticket was reviewed on both axes (`cr-spec` + `cr-standards`) before merge.

## Known, non-blocking

- **#143** the verdict ignores never-reported Lanes when other Lanes have reported, and the per-Site table lists Sites that have Series rather than the whole registry. The ticket prose asks for eight hygiene figures per Site; the design mock and the landed `.tbl.sites` grid both say six columns, and the mock won.
- **#146** two `SeriesPage` scans per press instead of a keyed read — `ponytail:`-commented in-tree with the upgrade path.
- **#147** a paused Site with no pass row yet renders no row and so no control, since the Lanes page lists Sites that have passed.
- **#141** a sibling browser Lane declining at the top of a pass records as `sidecar-down`. Specified deliberately; the later spec in this series settles it.

Reviewed-on: #148
Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com>
Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>

backend/api_test.go

@@ -48,7 +48,7 @@ func TestMain(m *testing.M) { os.Exit(pgtest.Main(m)) }
 
 func newTestServer(t *testing.T) http.Handler {
 	t.Helper()
-	return newRouter(newTestStore(t), testConfig(), nil)
+	return newRouter(newTestStore(t), testConfig())
 }
 
 func newTestStore(t *testing.T) *store.Store {
@@ -599,7 +599,7 @@ func TestLoadConfigDiscord(t *testing.T) {
 // cooldown and the poller would re-fetch that series on every single tick.
 func TestPutDoesNotClobberLatestCheckedAt(t *testing.T) {
 	s := newTestStore(t)
-	srv := newRouter(s, testConfig(), nil)
+	srv := newRouter(s, testConfig())
 
 	seedForCheck(t, s, "asura:x", "https://asurascans.com/comics/x", 777)
 
@@ -627,7 +627,7 @@ func TestPutDoesNotClobberLatestCheckedAt(t *testing.T) {
 // series stops being due the moment the PUT lands.
 func TestPutRecordsASighting(t *testing.T) {
 	s := newTestStore(t)
-	srv := newRouter(s, testConfig(), nil)
+	srv := newRouter(s, testConfig())
 
 	now := time.Now().UnixMilli()
 	hour := time.Hour.Milliseconds()
@@ -677,7 +677,7 @@ func TestUserscriptServedWithWebUIDisabled(t *testing.T) {
 
 	rr := httptest.NewRecorder()
 	req := httptest.NewRequest(http.MethodGet, "/u/"+ownerCredential()+"/manga-bookmark.user.js", nil)
-	newRouter(s, cfg, nil).ServeHTTP(rr, req)
+	newRouter(s, cfg).ServeHTTP(rr, req)
 	if rr.Code != http.StatusOK {
 		t.Fatalf("status = %d, want 200", rr.Code)
 	}
@@ -699,7 +699,7 @@ func TestNovelUserscriptServed(t *testing.T) {
 
 	cfg := testConfig()
 	cfg.NovelUserscriptPath = novelPath
-	srv := newRouter(s, cfg, nil)
+	srv := newRouter(s, cfg)
 
 	rr := httptest.NewRecorder()
 	srv.ServeHTTP(rr, httptest.NewRequest(http.MethodGet,