feat(desktop): implement workspace foundation + desktop-client skeleton

Plan 0 (workspaces): add workspaces + workspace_memberships schema, extend
JWT/Actor/claims with primary_workspace_id, seed default workspace per tenant,
thread workspace_id through tenant monitoring quota.

Plan A (desktop skeleton): new Electron app (apps/desktop-client) with main/
preload/renderer, shared Vue component package (packages/ui-shared), and server
surface — desktop client registration + token rotation + heartbeat, SSE task
event stream, desktop accounts/tasks/content handlers, publish job endpoint,
and supporting repositories, services, sqlc queries, and migrations.

Hard cutover per plan: remove browser-extension monitoring callback endpoints,
stub legacy media API in admin-web, and delete monitoring_callback_handler.go.

server/internal/tenant/transport/publish_job_handler.go

@@ -0,0 +1,35 @@
+package transport
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"github.com/geo-platform/tenant-api/internal/bootstrap"
+	"github.com/geo-platform/tenant-api/internal/shared/auth"
+	"github.com/geo-platform/tenant-api/internal/shared/response"
+	"github.com/geo-platform/tenant-api/internal/tenant/app"
+)
+
+type PublishJobHandler struct {
+	svc *app.PublishJobService
+}
+
+func NewPublishJobHandler(a *bootstrap.App) *PublishJobHandler {
+	return &PublishJobHandler{
+		svc: app.NewPublishJobService(a.DB, a.RabbitMQ, a.Logger),
+	}
+}
+
+func (h *PublishJobHandler) Create(c *gin.Context) {
+	var req app.CreatePublishJobRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
+		return
+	}
+
+	data, err := h.svc.Create(c.Request.Context(), auth.MustActor(c.Request.Context()), req)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+	response.SuccessWithStatus(c, 201, data)
+}