test(chat,playout): enable test suite, coverage gate, switch to pure-Go SQLite driver

backend/chat/go.mod

@@ -3,24 +3,33 @@ module chat
 go 1.25.0
 
 require (
+	github.com/glebarez/sqlite v1.11.0
 	github.com/gorilla/websocket v1.5.3
 	github.com/redis/go-redis/v9 v9.7.0
 	gorm.io/driver/postgres v1.5.11
-	gorm.io/driver/sqlite v1.5.7
 	gorm.io/gorm v1.25.12
 )
 
 require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/glebarez/go-sqlite v1.21.2 // indirect
+	github.com/google/uuid v1.3.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/pgx/v5 v5.7.5 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/mattn/go-sqlite3 v1.14.22 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	golang.org/x/crypto v0.37.0 // indirect
 	golang.org/x/sync v0.13.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
 	golang.org/x/text v0.24.0 // indirect
+	modernc.org/libc v1.22.5 // indirect
+	modernc.org/mathutil v1.5.0 // indirect
+	modernc.org/memory v1.5.0 // indirect
+	modernc.org/sqlite v1.23.1 // indirect
 )