feat(web): 账号即环境 UI 收敛——删 /browsers 页面，环境并入账号详情

- 删除 /browsers 列表/创建/详情页与菜单项，运行环境不再是独立资源
- 账号详情：GET /api/phase-a/accounts/:id 内联 environment 字段
  （网关/出口/绑定版本/运行实例/不可调度原因），固定资源卡直接展示
- 状态卡两态开关：暂停→「启动账号」（start=resume+启动环境），
  运行中→「暂停账号」（联动停环境）；出口重绑卡片内完成
  （POST /network-exits/:id/rebind 返回内联 environment，出口切换不再跳环境页）
- 删除 creator/settings 残留的转写服务字段（后端 settings 无此列）
- helpers.ts accountReadiness 改用 runtime_id/runtime_cleanup_pending
- network-exits 列表绑定账号列改由账号列表内联数据驱动
- 全量验证：go test ./...（PG）全绿、tsc --noEmit 通过、max build 通过、
  node --test 12/12 通过

internal/controlplane/api/accounts_operations.go

@@ -71,13 +71,7 @@ func RegisterAccountRoutes(app *fiber.App, store *accountdomain.Store, runtimeSt
 		return c.JSON(accounts)
 	})
 
-	app.Get("/api/phase-a/accounts/:id", func(c fiber.Ctx) error {
-		account, err := store.GetAccount(c.Context(), c.Params("id"))
-		if err != nil {
-			return phaseAError(c, err)
-		}
-		return c.JSON(account)
-	})
+	app.Get("/api/phase-a/accounts/:id", accountDetailPayload(store, runtimeStore))
 
 	app.Post("/api/phase-a/accounts/:id/pause", func(c fiber.Ctx) error {
 		unlock, err := lockAccountResources(c.Context(), runtimeStore, c.Params("id"))
@@ -290,3 +284,37 @@ func phaseAError(c fiber.Ctx, err error) error {
 func PhaseAError(c fiber.Ctx, err error) error {
 	return phaseAError(c, err)
 }
+
+// accountEnvironmentView 账号详情/出口重绑共用：账号即环境下内联展示的环境视图（schedule_block_reason 取值同 envView）。
+func accountEnvironmentView(environment hub.EnvironmentContext) map[string]any {
+	scheduleStatus, scheduleBlockReason := environmentScheduleReadiness(environment)
+	return map[string]any{
+		"alias": environment.Alias, "name": environment.Name, "gateway": environment.Gateway,
+		"binding_version": environment.BindingVersion, "runtime_id": environment.RuntimeID,
+		"runtime_cleanup_pending": environment.RuntimeCleanupPending,
+		"network_exit_id":         environment.Exit.ID, "network_exit_health": environment.Exit.HealthStatus,
+		"schedule_status": scheduleStatus, "schedule_block_reason": scheduleBlockReason,
+	}
+}
+
+// accountDetailPayload 账号详情：环境信息内联在响应中（账号即环境），前端无需单独请求 /browsers。
+func accountDetailPayload(store *accountdomain.Store, runtimeStore HubStore) fiber.Handler {
+	return func(c fiber.Ctx) error {
+		account, err := store.GetAccount(c.Context(), c.Params("id"))
+		if err != nil {
+			return phaseAError(c, err)
+		}
+		payload := map[string]any{
+			"id": account.ID, "name": account.Name, "platform": account.Platform,
+			"platform_account_key": account.PlatformAccountKey, "tags": account.Tags,
+			"authorization_status": account.AuthorizationStatus, "runtime_status": account.RuntimeStatus,
+			"version": account.Version,
+		}
+		if runtimeStore != nil {
+			if environment, envErr := runtimeStore.GetEnvironmentContextForAccount(c.Context(), account.ID); envErr == nil {
+				payload["environment"] = accountEnvironmentView(environment)
+			}
+		}
+		return c.JSON(payload)
+	}
+}

internal/controlplane/api/environments.go

@@ -1975,7 +1975,7 @@ func rebindBrowser(store HubStore, probe NetworkExitProbe, resolve func(hub.Netw
 	if err := finish("succeeded", "environment_rebound", after); err != nil {
 		return hubError(c, err)
 	}
-	return c.JSON(after)
+	return c.JSON(map[string]any{"account_id": after.AccountID, "environment": accountEnvironmentView(after)})
 }
 
 func deleteBrowser(store HubStore) fiber.Handler {