fix: add RENOVATE_ENDPOINT for Gitea self-hosted instance

Phase 4 Gitea migration — Renovate CLI needs the endpoint URL to
connect to the self-hosted git.farh.net instance.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/renovate.yaml

@@ -16,11 +16,12 @@ jobs:
         env:
           RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
           RENOVATE_PLATFORM: gitea
+          RENOVATE_ENDPOINT: https://git.farh.net
           RENOVATE_AUTODISCOVER: "true"
           LOG_LEVEL: debug
         run: |
           npx renovate \
             --token="${RENOVATE_TOKEN}" \
             --platform=gitea \
-            --autodiscover=true \
+            --endpoint=https://git.farh.net \
             --configurationFile=renovate-config.json