feat: add Discord notifications for CI/CD pipeline status

Added two notification jobs that send Discord webhooks:
- notify-success: Sends a green embed when pipeline succeeds
- notify-failure: Sends a red embed when pipeline fails

Notifications include:
- Repository and branch information
- Commit SHA with clickable link
- Docker image names (backend & frontend)
- Link to workflow run for debugging

Requires DISCORD_WEBHOOK_URL secret to be configured in repository settings.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/ci.yml

@@ -227,17 +227,123 @@ jobs:
           echo "## 🚀 Deployment Summary" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "### Backend Image" >> $GITHUB_STEP_SUMMARY
-          echo "- Registry: \`${{ env.REGISTRY }}/backend\`" >> $GITHUB_STEP_SUMMARY
+          echo "- Registry: \`${{ env.REGISTRY }}/xpeditis-backend\`" >> $GITHUB_STEP_SUMMARY
           echo "- Branch: \`${{ github.ref_name }}\`" >> $GITHUB_STEP_SUMMARY
           echo "- Commit: \`${{ github.sha }}\`" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "### Frontend Image" >> $GITHUB_STEP_SUMMARY
-          echo "- Registry: \`${{ env.REGISTRY }}/frontend\`" >> $GITHUB_STEP_SUMMARY
+          echo "- Registry: \`${{ env.REGISTRY }}/xpeditis-frontend\`" >> $GITHUB_STEP_SUMMARY
           echo "- Branch: \`${{ github.ref_name }}\`" >> $GITHUB_STEP_SUMMARY
           echo "- Commit: \`${{ github.sha }}\`" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "### Pull Commands" >> $GITHUB_STEP_SUMMARY
           echo "\`\`\`bash" >> $GITHUB_STEP_SUMMARY
-          echo "docker pull ${{ env.REGISTRY }}/backend:${{ github.ref_name }}" >> $GITHUB_STEP_SUMMARY
+          echo "docker pull ${{ env.REGISTRY }}/xpeditis-backend:${{ github.ref_name }}" >> $GITHUB_STEP_SUMMARY
-          echo "docker pull ${{ env.REGISTRY }}/frontend:${{ github.ref_name }}" >> $GITHUB_STEP_SUMMARY
+          echo "docker pull ${{ env.REGISTRY }}/xpeditis-frontend:${{ github.ref_name }}" >> $GITHUB_STEP_SUMMARY
           echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
+
+  # ============================================
+  # Discord Notification - Success
+  # ============================================
+  notify-success:
+    name: Discord Notification (Success)
+    runs-on: ubuntu-latest
+    needs: [backend, frontend]
+    if: success()
+
+    steps:
+      - name: Send Discord notification
+        run: |
+          curl -H "Content-Type: application/json" \
+            -d '{
+              "embeds": [{
+                "title": "✅ CI/CD Pipeline Success",
+                "description": "Deployment completed successfully!",
+                "color": 3066993,
+                "fields": [
+                  {
+                    "name": "Repository",
+                    "value": "${{ github.repository }}",
+                    "inline": true
+                  },
+                  {
+                    "name": "Branch",
+                    "value": "${{ github.ref_name }}",
+                    "inline": true
+                  },
+                  {
+                    "name": "Commit",
+                    "value": "[${{ github.sha }}](${{ github.event.head_commit.url }})",
+                    "inline": false
+                  },
+                  {
+                    "name": "Backend Image",
+                    "value": "`${{ env.REGISTRY }}/xpeditis-backend:${{ github.ref_name }}`",
+                    "inline": false
+                  },
+                  {
+                    "name": "Frontend Image",
+                    "value": "`${{ env.REGISTRY }}/xpeditis-frontend:${{ github.ref_name }}`",
+                    "inline": false
+                  },
+                  {
+                    "name": "Workflow",
+                    "value": "[${{ github.workflow }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})",
+                    "inline": false
+                  }
+                ],
+                "timestamp": "${{ github.event.head_commit.timestamp }}",
+                "footer": {
+                  "text": "Xpeditis CI/CD"
+                }
+              }]
+            }' \
+            ${{ secrets.DISCORD_WEBHOOK_URL }}
+
+  # ============================================
+  # Discord Notification - Failure
+  # ============================================
+  notify-failure:
+    name: Discord Notification (Failure)
+    runs-on: ubuntu-latest
+    needs: [backend, frontend]
+    if: failure()
+
+    steps:
+      - name: Send Discord notification
+        run: |
+          curl -H "Content-Type: application/json" \
+            -d '{
+              "embeds": [{
+                "title": "❌ CI/CD Pipeline Failed",
+                "description": "Deployment failed! Check the logs for details.",
+                "color": 15158332,
+                "fields": [
+                  {
+                    "name": "Repository",
+                    "value": "${{ github.repository }}",
+                    "inline": true
+                  },
+                  {
+                    "name": "Branch",
+                    "value": "${{ github.ref_name }}",
+                    "inline": true
+                  },
+                  {
+                    "name": "Commit",
+                    "value": "[${{ github.sha }}](${{ github.event.head_commit.url }})",
+                    "inline": false
+                  },
+                  {
+                    "name": "Workflow",
+                    "value": "[${{ github.workflow }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})",
+                    "inline": false
+                  }
+                ],
+                "timestamp": "${{ github.event.head_commit.timestamp }}",
+                "footer": {
+                  "text": "Xpeditis CI/CD"
+                }
+              }]
+            }' \
+            ${{ secrets.DISCORD_WEBHOOK_URL }}