feat(cli): v2 — full API coverage, profiles, --json/--yes, containr up

Rewrite the CLI as a thin client over the authenticated API so agents
and scripts reach every resource the UI does (ROADMAP2 phase A2).

- shared Client with bearer auth, error-envelope decoding, and stable
  exit codes: 0 ok / 1 error / 2 auth / 3 not-found / 4 validation /
  5 unreachable
- named profiles in ~/.containr.yaml (current_profile + profiles.*);
  resolution order --flag > env > profile > localhost default;
  CONTAINR_TOKEN / CONTAINR_API_URL / CONTAINR_PROFILE env support
- --json prints raw API responses; --yes skips confirmations;
  destructive commands refuse non-interactively without it
- auth login verifies the token against /user/profile before saving,
  interactive prompt via term.ReadPassword
- commands for every resource: tokens, projects, services, deploy,
  deployments (logs/rollback), logs --follow (SSE), exec, variables
  (set/unset merge with secret masking preserved), databases
  (backup/restore/download), cron, templates, nodes + agent tokens,
  scaling, ha, security, gateway, admin, notifications
- containr up: git remote + branch → create-or-reuse service → deploy

Verified live: login/status/tokens/projects/services, up creating a
service + deployment, non-TTY confirmation refusal, scope-capped admin
rejection (exit 2), revoke.

Authored By: TDvorak <[email protected]>

app/backend/internal/cli/commands/notifications.go

@@ -0,0 +1,65 @@
+package commands
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// NotificationsCmd lists and manages notifications.
+var NotificationsCmd = &cobra.Command{
+	Use:     "notifications",
+	Aliases: []string{"notifs"},
+	Short:   "Manage notifications",
+}
+
+var notifListCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List notifications",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		data, err := c.Do("GET", "/notifications", nil)
+		if err != nil {
+			return err
+		}
+		items, err := unwrapList(data, "notifications")
+		if err != nil {
+			return err
+		}
+		rows := make([][]string, 0, len(items))
+		for _, n := range items {
+			rows = append(rows, []string{
+				str(n, "id"), str(n, "type"), str(n, "title"), str(n, "read"), relTime(n, "created_at"),
+			})
+		}
+		printRows(data, []string{"ID", "TYPE", "TITLE", "READ", "AGE"}, rows)
+		return nil
+	},
+}
+
+var notifReadCmd = &cobra.Command{
+	Use:   "read <id>|all",
+	Short: "Mark a notification (or all) as read",
+	Args:  cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		path := "/notifications/" + args[0] + "/read"
+		if args[0] == "all" {
+			path = "/notifications/read-all"
+		}
+		data, err := c.Do("POST", path, map[string]interface{}{})
+		if err != nil {
+			return err
+		}
+		PrintRaw(data)
+		return nil
+	},
+}
+
+func init() {
+	NotificationsCmd.AddCommand(notifListCmd, notifReadCmd)
+}