feat(modules): add windows-rdp-keepalive module

[Quantum-Forge-Code]

Description

This PR adds a new windows-rdp-keepalive module that monitors active RDP connections and extends workspace session timeouts while RDP is connected.

Problem

The existing activity bump system only tracks SSH, VSCode, JetBrains, and reconnecting PTY connections. Windows users connecting via RDP for GUI applications may have their workspaces time out during active work.

Solution

A PowerShell script that:

1. Runs in the background on workspace startup
2. Checks for active RDP sessions every N seconds (default: 30)
3. Bumps workspace activity when RDP connections are detected
4. Logs activity for debugging

Features

• Uses qwinsta with WMI fallback for RDP detection
• Configurable check interval
• Can be enabled/disabled
• Logs to %TEMP%\rdp-keepalive.log

Usage

module "windows-rdp-keepalive" {
  source   = "registry.coder.com/coder/windows-rdp-keepalive/coder"
  version  = "1.0.0"
  agent_id = coder_agent.main.id
}

Checklist

• Module created with main.tf, README.md, .tftest.hcl
• README has proper frontmatter
• Tests included
• Documentation complete

Closes #200

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Bounty submission 💎 $150

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[chatgpt-codex-connector]

Rename hyphenated resource reference

In Terraform expressions, attribute traversal uses identifiers, so coder_script.rdp-keepalive is parsed as coder_script.rdp - keepalive rather than a single resource name. That makes this assertion fail to evaluate (and any future references to the resource will error) because subtraction on a resource object is invalid and keepalive is undefined. Use an underscore in the resource label (e.g., rdp_keepalive) and update references accordingly to avoid plan/test failures.

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