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...")
 		}
 	}()

internal/common/env.go

@@ -13,6 +13,8 @@ var (
 	IsDebug = env.GetEnvBool("DEBUG", IsTest)
 	IsTrace = env.GetEnvBool("TRACE", false) && IsDebug
 
+	InitTimeout = env.GetEnvDuation("INIT_TIMEOUT", 1*time.Minute)
+
 	ShortLinkPrefix = env.GetEnvString("SHORTLINK_PREFIX", "go")
 
 	ProxyHTTPAddr,