Use AHKPP_DEBUG instead of DEBUG env variable to avoid conflicts with other extensions

[Copilot]

Any VS Code extension setting DEBUG to a non-empty string (e.g., OpenAI Codex sets DEBUG=release) causes AHK++ to resolve out/server.js instead of dist/server.js, crashing on startup due to JavaScript's truthy semantics.

Changes proposed in this pull request:

• ahk2/client/src/extension.ts: Replace process.env.DEBUG with process.env.AHKPP_DEBUG in server path resolution and debug mode log
• ahk2/client/src/browserClientMain.ts: Replace process.env.DEBUG with process.env.AHKPP_DEBUG in extension URI determination

// Before
server/${process.env.DEBUG ? 'out' : 'dist'}/server.js

// After
server/${process.env.AHKPP_DEBUG ? 'out' : 'dist'}/server.js

Original prompt

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This section details on the original issue you should resolve

<issue_title>process.env.DEBUG truthy check causes wrong server path when other extensions set DEBUG variable</issue_title>
<issue_description>## Description

AHK++ fails to start when another VS Code extension sets DEBUG environment variable to a non-empty string (e.g. OpenAI Codex sets DEBUG=release).
The extension resolves the server path using:

process.env.DEBUG ? "out" : "dist"

Since any non-empty string is truthy in JavaScript, AHK++ picks out/server.js instead of dist/server.js, which doesn't exist, causing the server to crash on startup.

Reproduction steps

Steps to reproduce the behavior:

1. Install OpenAI Codex extension
2. Restart VS Code
3. AHK++ server fails to start with Cannot find module '...server/out/server.js'

Fix suggestion

Replace the truthy check with a strict comparison:

process.env.DEBUG === "true" ? "out" : "dist"

</issue_description>

<agent_instructions>Change the variable to ahkpp_debug, choose whatever casing makes the most sense, and see if there's a way to add automated checks. If there isn't, that's fine, only add them if you're highly confident they'll work</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@mark-wiemer Ah, that makes sense, I didn't think about other extensions! I should have a fix for this in a couple weeks, extremely busy right now. But I am working on some Windows-specific projects now so it's easy for me to pop over to AHK++ again :)

• Fixes process.env.DEBUG truthy check causes wrong server path when other extensions set DEBUG variable #701

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[ewerybody]

was copilot doing this on it's own?!! :D

[mark-wiemer]

@ewerybody I asked Copilot to do this, yes, to save me some time :) I don't have time to review it this weekend but do plan to start coding a lot more in April. March is looking to be extremely busy for me!