feat(windows-rdp): add native client option

[Edd88-pixel]

Why

The windows-rdp module currently exposes only the browser-based client. This change also provides a one-click native RDP experience through Coder Desktop.

Native RDP is enabled by default. Existing users who want to keep web-only access can set enable_native_rdp = false.

Changes

• add an RDP Desktop app, enabled by default, using the existing Coder Desktop coder:// RDP URI pattern
• add agent_name, required when native RDP is enabled, with cross-variable validation and a Terraform minimum version of 1.9
• allow users to opt out of the native app with enable_native_rdp = false while preserving the existing Web RDP app
• URL-encode the administrator username and password passed to the native client
• add a dedicated native RDP icon and a configurable tooltip explaining the Coder Desktop requirement
• add Terraform coverage for the disabled state, the required agent name, and the default-enabled state
• document the default behavior, web-only opt-out, Coder Desktop prerequisite, and 1.4.0 usage examples

Validation

• terraform fmt -check — passed
• terraform validate — passed
• terraform test — 3 passed, 0 failed
• integrated-browser validation — one visible and enabled RDP Desktop link rendered with the expected coder://.../agent/main/rdp URI

Description

Adds native RDP access through Coder Desktop by default while keeping the existing Web RDP app available. Consumers must provide agent_name when native RDP is enabled, or set enable_native_rdp = false for web-only access.

Type of Change

• New module
• New template
• Bug fix
• Feature/enhancement
• Documentation
• Other

Module Information

Path: registry/coder/modules/windows-rdp
New version: v1.4.0
Breaking change: [x] Yes [ ] No

Compatibility note: upgrading consumers must provide agent_name or explicitly disable native RDP. The module now requires Terraform 1.9 or newer.

Testing & Validation

• Tests pass (terraform test and bun test)
• Code formatted (terraform fmt -check)
• Changes tested locally

Related Issues

Closes #1061

[DevelopmentCats]

I think the one main thing that I notice here @Edd88-pixel is that this isn't really an opt-in change as the PR describes its defaulted to true so its something that will be enforced for anyone using this new module version.

[Edd88-pixel]

I’ll update the PR description to reflect that native RDP is enabled by default now.