feat(api): search with Meilisearch (M2)

- artists, albums and tracks indexes are rebuilt from PostgreSQL next
  to the live ones and swapped in, so search keeps working; a rebuild
  runs on start, after every scan and when a source is removed
- transliteration fields (Кино ↔ kino) and a retry in the other
  keyboard layout (ghbdtn → привет) reported as corrected_query
- /search/suggest (3 artists, 3 albums, 5 tracks), /search by type
  with cursor pages, /admin/search/reindex; Meilisearch is part of
  /readyz
- found ids are hydrated from the catalog, so a lagging index never
  returns deleted entries

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

services/api/internal/search/translit_test.go

@@ -0,0 +1,22 @@
+package search
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTranslit(t *testing.T) {
+	assert.Equal(t, "kino", Translit("Кино"))
+	assert.Equal(t, "shchedrin", Translit("Щедрин"))
+	assert.Equal(t, "кино", Translit("Kino"))
+	assert.Equal(t, "щедрин", Translit("shchedrin"))
+	assert.Equal(t, "", Translit("1984"))
+}
+
+func TestSwitchLayout(t *testing.T) {
+	assert.Equal(t, "привет", SwitchLayout("ghbdtn"))
+	assert.Equal(t, "hello", SwitchLayout("руддщ"))
+	assert.Equal(t, "кино", SwitchLayout("rbyj"))
+	assert.Equal(t, "", SwitchLayout("123"))
+}