fix: register task pause/resume routes under /api/v2 (#22544)

The pause/resume endpoints were only registered under /api/experimental
but the frontend and Go SDK were calling /api/v2, resulting in 404s.
Register the routes in the v2 group, update the SDK client paths, and
fix swagger annotations (Accept → Produce) since these POST endpoints
have no request body.

coderd/coderd.go

@@ -1794,6 +1794,8 @@ func New(options *Options) *API {
 					r.Patch("/input", api.taskUpdateInput)
 					r.Post("/send", api.taskSend)
 					r.Get("/logs", api.taskLogs)
+					r.Post("/pause", api.pauseTask)
+					r.Post("/resume", api.resumeTask)
 				})
 			})
 		})