feat(ops): /operations endpoint + page — live jobs, queue depth, failures

GET /api/v1/operations aggregates active deployments, per-service
deploy-queue depth via Queue.Snapshot(), 24h deployment failures,
cron runs and backups scoped to the caller's projects (admins see all).

Frontend /operations page (Operate nav) shows in-flight count, queued
depth, failures and backup stats with live refetch while deploys are
active. CLI `containr operations` + MCP containr_operations_get.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

docs/api/openapi.yaml

@@ -2533,6 +2533,54 @@ paths:
               schema:
                 $ref: '#/components/schemas/MessageResponse'
 
+  /operations:
+    get:
+      tags:
+        - Operations
+      summary: Cross-cutting operations view
+      description: |
+        Single snapshot of platform work scoped to the caller's projects
+        (admins see all): active deployments, in-memory deploy-queue
+        depth per service, deployments that failed in the last 24h,
+        cron executions and database backups from the last 24h.
+      security:
+        - bearerAuth: []
+      responses:
+        '200':
+          description: Operations snapshot
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  active_deployments:
+                    type: array
+                    items:
+                      type: object
+                  deploy_queue:
+                    type: array
+                    items:
+                      type: object
+                      properties:
+                        service_id:
+                          type: string
+                        running:
+                          type: boolean
+                        queued:
+                          type: integer
+                  recent_failures:
+                    type: array
+                    items:
+                      type: object
+                  cron_runs:
+                    type: array
+                    items:
+                      type: object
+                  backups:
+                    type: array
+                    items:
+                      type: object
+
   # Audit Logs
   /audit-logs:
     get: