enhance: add Repobeats visual analytics to Discord report

- Include Repobeats chart URL in the weekly metrics message
- Provides visual complement to the text-based metrics
- Shows broader repository health and trends

.github/workflows/weekly-metrics-discord.yml

@@ -77,6 +77,9 @@ jobs:
             • Merged: ${{ steps.metrics.outputs.prs_merged }}
             • Avg Response Time: ${{ steps.metrics.outputs.pr_avg_first_response }}
             • Avg Time to Merge: ${{ steps.metrics.outputs.pr_avg_merge_time }}
+
+            **📈 Visual Analytics**
+            https://repobeats.axiom.co/api/embed/b439f28f0ab5bd7a2da19505355693cd2c55bfd4.svg
           color: 0x58AFFF
           username: Task Master Metrics Bot
           avatar_url: https://raw.githubusercontent.com/eyaltoledano/claude-task-master/main/images/logo.png