fix(gitea): use .UmamiSrc/.UmamiScript template vars for Umami analytics

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gitea/.env.example

@@ -4,4 +4,4 @@ RUNNER_TOKEN=change_me
 EMAIL_FROM=gitea@pivoine.art
 EMAIL_USER=Gitea
 UMAMI_SRC=https://umami.example.com/script.js
-UMAMI_ID=
+UMAMI_SCRIPT=

gitea/compose.yml

@@ -37,7 +37,7 @@ services:
       GITEA__ui__DEFAULT_THEME: nord
       GITEA__ui__ENABLE_FEED: "true"
       UMAMI_SRC: ${UMAMI_SRC}
-      UMAMI_ID: ${UMAMI_ID}
+      UMAMI_SCRIPT: ${UMAMI_SCRIPT}
     ports:
       - "2222:2222"
     volumes:

gitea/templates/custom/header.tmpl

@@ -1,3 +1,3 @@
 {{if and (eq .RunMode "prod") (not .IsSigned)}}
-<script defer src="{{env "UMAMI_SRC"}}" data-website-id="{{env "UMAMI_ID"}}"></script>
+<script defer src="{{.UmamiSrc}}" data-website-id="{{.UmamiScript}}"></script>
 {{end}}