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/platform/config/config.go

@@ -39,6 +39,9 @@ type API struct {
 	StorageAgentURL string `env:"STORAGE_AGENT_URL" envDefault:"http://storage-agent:8090"`
 	InternalToken   string `env:"INTERNAL_TOKEN"`
 	FFprobePath     string `env:"FFPROBE_PATH" envDefault:"ffprobe"`
+
+	MeiliURL       string `env:"MEILI_URL" envDefault:"http://meilisearch:7700"`
+	MeiliMasterKey string `env:"MEILI_MASTER_KEY"`
 }
 
 // StorageAgent — конфигурация внутреннего сервиса storage-agent.