update environment configuration for local development, enhance database initialization, and improve Nginx routing for admin access

backend/playout/src/playlist.go

@@ -64,6 +64,12 @@ func LoadPlaylist(playlistPath string) ([]VideoFile, error) {
 		if line == "" || strings.HasPrefix(line, "#") {
 			continue
 		}
+
+		if strings.HasPrefix(line, "file ") {
+			line = strings.TrimSpace(strings.TrimPrefix(line, "file "))
+			line = strings.Trim(line, "'\"")
+		}
+
 		videos = append(videos, VideoFile{Path: line})
 	}
 
@@ -177,8 +183,9 @@ func main() {
 			"-f", "hls",
 			"-hls_time", "6",
 			"-hls_list_size", "24",
+			"-strftime", "1",
 			"-hls_flags", "delete_segments+append_list+independent_segments",
-			"-hls_segment_filename", "/app/hls/segment_%Y%m%d_%H%M%S_%%03d.ts", // unique immutable names per ADR-001
+			"-hls_segment_filename", "/app/hls/segment_%Y%m%d_%H%M%S.ts",
 			"/app/hls/playlist.m3u8")
 
 		if err := cmd.Run(); err != nil {