fix(ci): Handle 201 status code for package linking

The Gitea package link API returns 201 (Created) on successful linking,
not 204 (No Content) as we were checking for. Updated the link-packages
step to accept both 201 and 204 as success.

Also added visual indicators (✅/❌) to make link status clearer in logs.

Diagnostic output showed all 5 packages successfully linked with 201:
- stack-api: 201 (linked)
- stack-web: 201 (linked)
- stack-postgres: 201 (linked)
- stack-openbao: 201 (linked)
- stack-orchestrator: 201 (linked)

Subsequent runs return 400 "invalid argument" which means already linked.

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

.woodpecker.yml

@@ -282,12 +282,12 @@ steps:
           STATUS=$(curl -s -o /dev/null -w "%{http_code}" -X POST \
             -H "Authorization: token $GITEA_TOKEN" \
             "https://git.mosaicstack.dev/api/v1/packages/mosaic/container/${package}/-/link/stack")
-          if [ "$STATUS" = "204" ]; then
-            echo "Linked ${package} to stack"
+          if [ "$STATUS" = "201" ] || [ "$STATUS" = "204" ]; then
+            echo "✅ Linked ${package} to stack"
           elif [ "$STATUS" = "400" ]; then
-            echo "${package} already linked (OK)"
+            echo "✅ ${package} already linked (OK)"
           else
-            echo "Warning: ${package} link returned $STATUS"
+            echo "❌ Warning: ${package} link returned $STATUS"
           fi
         done
     when: