Spec #135: owner data-correction actions — Latest Chapter, series_url, Cover, orphan removal (#156)

Implements spec #135 (spec 2 of 4, derived from wayfinder map #114; decisions settled in #120/#121/#125/#131). Blocked-by #134 is merged, so this lands on `main`.

Four owner actions the dashboard can now perform, one ticket each:

- **#149** — Latest Chapter correction: one numeric input, overwritten by the next machine write.
- **#151** — Series URL repair: owner-typed, gated by the poller's own fetch gate.
- **#150 / #153 / #154** — Cover replacement: addresses derived from bytes (`#150`), a Forced Poll replaces the Cover while an ordinary pass still only fills a blank one (`#153`), and byte reclamation is one guarded helper, file first / covers row last (`#154`).
- **#155** — Orphan removal: one Series at a time, with the foreign key as the guard.

Plus **#152** — Latest Chapter provenance: one derived line naming the actor class, so an owner can tell a hand-edited number from a machine read.

- Migration `0015_latest_correction.sql` adds the correction/provenance columns; `0009` now derives cover addresses from bytes.
- ADR `0014-cover-addresses-from-bytes.md` records the address scheme.

Backend tests cover the store, poller, admin handlers, and web routes (`go test ./...`, needs Docker).

Reviewed-on: #156
Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com>
Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>

backend/internal/latest/acquire_test.go

@@ -123,10 +123,10 @@ func TestAcquireFillsChapterAndCoverFromOneFetch(t *testing.T) {
 	if got.LatestChapterNum == nil || *got.LatestChapterNum != 181 {
 		t.Fatalf("LatestChapterNum = %v, want 181", got.LatestChapterNum)
 	}
-	if want := testCoverBaseURL + "/covers/" + store.CoverAddress(acquireCoverURL); got.Cover != want {
+	if want := testCoverBaseURL + "/covers/" + store.CoverAddressForBytes([]byte("cover-bytes")); got.Cover != want {
 		t.Fatalf("Cover = %q, want the absolute address %q", got.Cover, want)
 	}
-	body, contentType, ok, err := s.CoverByAddress(store.CoverAddress(acquireCoverURL))
+	body, contentType, ok, err := s.CoverByAddress(store.CoverAddressForBytes([]byte("cover-bytes")))
 	if err != nil || !ok {
 		t.Fatalf("CoverByAddress = %v, %v", ok, err)
 	}
@@ -182,7 +182,7 @@ func TestAcquireSkipsAnExistingSeries(t *testing.T) {
 		t.Fatalf("cover fetches = %d, want 1", got)
 	}
 	got := readBookmark(t, s, acquireKey)
-	if want := testCoverBaseURL + "/covers/" + store.CoverAddress(acquireCoverURL); got.Cover != want {
+	if want := testCoverBaseURL + "/covers/" + store.CoverAddressForBytes([]byte("cover-bytes")); got.Cover != want {
 		t.Fatalf("Cover = %q, want the acquired one %q", got.Cover, want)
 	}
 }
@@ -343,10 +343,10 @@ func TestAcquireKaganeCoverThroughBrowser(t *testing.T) {
 		t.Fatalf("browser cover fetched URL %q, want %q", got, kaganeCoverSrc)
 	}
 	got := readBookmark(t, s, kaganeKey)
-	if want := testCoverBaseURL + "/covers/" + store.CoverAddress(kaganeCoverSrc); got.Cover != want {
+	if want := testCoverBaseURL + "/covers/" + store.CoverAddressForBytes([]byte("cover-bytes")); got.Cover != want {
 		t.Fatalf("Cover = %q, want the content-addressed URL %q", got.Cover, want)
 	}
-	body, contentType, ok, err := s.CoverByAddress(store.CoverAddress(kaganeCoverSrc))
+	body, contentType, ok, err := s.CoverByAddress(store.CoverAddressForBytes([]byte("cover-bytes")))
 	if err != nil || !ok {
 		t.Fatalf("CoverByAddress = %v, %v", ok, err)
 	}
@@ -381,7 +381,7 @@ func TestAcquireNovelfullCoverOverPlainTLS(t *testing.T) {
 		t.Fatalf("cover fetched from %q, want %q", got, novelfullCoverURL)
 	}
 	got := readBookmark(t, s, novelfullKey)
-	if want := testCoverBaseURL + "/covers/" + store.CoverAddress(novelfullCoverURL); got.Cover != want {
+	if want := testCoverBaseURL + "/covers/" + store.CoverAddressForBytes([]byte("cover-bytes")); got.Cover != want {
 		t.Fatalf("Cover = %q, want %q", got.Cover, want)
 	}
 }
@@ -451,7 +451,7 @@ func TestAcquireNovelfullCoverWithoutBrowser(t *testing.T) {
 		t.Fatalf("cover fetches = %d, want 1", got)
 	}
 	got := readBookmark(t, s, novelfullKey)
-	if want := testCoverBaseURL + "/covers/" + store.CoverAddress(novelfullCoverURL); got.Cover != want {
+	if want := testCoverBaseURL + "/covers/" + store.CoverAddressForBytes([]byte("cover-bytes")); got.Cover != want {
 		t.Fatalf("Cover = %q, want %q", got.Cover, want)
 	}
 }