fix(ci): update infra manifests after blue-green swap

.gitea/workflows/deploy-gke.yaml

@@ -200,6 +200,46 @@ jobs:
             --image "${{ steps.vars.outputs.image }}" \
             --slot "${{ steps.vars.outputs.slot }}"
 
+      - name: Update infrastructure manifests
+        if: success()
+        env:
+          INFRA_GIT_TOKEN: ${{ secrets.INFRA_GIT_TOKEN }}
+        run: |
+          SLOT="${{ steps.vars.outputs.slot }}"
+          if [ "$SLOT" = "blue" ]; then IDLE="green"; else IDLE="blue"; fi
+
+          git clone "http://${INFRA_GIT_TOKEN}@34.31.145.131/neuron-technologies/infrastructure.git" \
+            --depth=1 --branch=main /tmp/infra-update
+
+          cd /tmp/infra-update
+
+          DEPLOY_DIR="platform/k8s/neuron-mcp"
+          python3 -c "
+import re, sys
+
+slot = sys.argv[1]
+idle = sys.argv[2]
+
+def set_replicas(path, count):
+    with open(path) as f:
+        content = f.read()
+    content = re.sub(r'^(  replicas: )\d+', r'\g<1>' + str(count), content, count=1, flags=re.MULTILINE)
+    with open(path, 'w') as f:
+        f.write(content)
+    print(f'  {path}: replicas set to {count}')
+
+set_replicas(f'{DEPLOY_DIR}/deployment-{slot}.yaml', 1)
+set_replicas(f'{DEPLOY_DIR}/deployment-{idle}.yaml', 0)
+" "$SLOT" "$IDLE"
+
+          git config user.email "ci@neurontechnologies.ai"
+          git config user.name "Neuron CI"
+          git add "${DEPLOY_DIR}/deployment-blue.yaml" "${DEPLOY_DIR}/deployment-green.yaml"
+          git diff --staged --quiet && { echo "No manifest changes needed"; exit 0; }
+          git commit -m "ci: neuron-mcp replica sync after blue-green swap to ${SLOT}"
+          git push origin main
+          echo "Infrastructure manifests updated: ${SLOT}=1, ${IDLE}=0"
+
       - name: Verify deployment
         run: |
           SLOT="${{ steps.vars.outputs.slot }}"