Add dedicated OIDC client ID for console-app

[rowan-stein]

User Request

Hardcode a dedicated OIDC client ID for the console-app (client_4XUh4_1VfUzpfYkN) instead of sharing the chat-app's oidc_client_id.

Specification

Changes Required

1. stacks/platform/variables.tf

Add a new variable:

variable "console_app_oidc_client_id" {
  type        = string
  description = "OIDC client ID for the console-app (public client)"
  default     = "client_4XUh4_1VfUzpfYkN"
}

2. stacks/platform/main.tf

In the console_app_values local, change the OIDC_CLIENT_ID env entry from:

{ name = "OIDC_CLIENT_ID", value = var.oidc_client_id }

To:

{ name = "OIDC_CLIENT_ID", value = var.console_app_oidc_client_id }

This gives console-app its own OIDC client, decoupled from chat-app.