chore(config): make initialization timeout configurable via environment variable

Replaced hardcoded 10-second initialization timeout with a configurable `INIT_TIMEOUT` environment variable.
The new default is 1 minute, allowing operators to adjust startup behavior based on their infrastructure requirements.

cmd/main.go

@@ -38,7 +38,7 @@ func main() {
 		select {
 		case <-done:
 			return
-		case <-time.After(time.Second * 10):
+		case <-time.After(common.InitTimeout):
 			log.Fatal().Msgf("timeout waiting for initialization to complete, exiting...")
 		}
 	}()