fix(openclaw): avoid appending /v1 to GitHub/Copilot provider hosts (fixes #14118)

[404-Page-Found]

What this PR does

Before this PR:

• OpenClaw provider base URLs in main process could have /v1 appended for some built-in providers (GitHub / Copilot), producing incorrect endpoints and 404s.

After this PR:

• Main process OpenClawService formats GitHub/Copilot provider hosts the same way the renderer does, avoiding appending /v1 for these providers. This prevents 404 errors when OpenClaw forwards requests.

Fixes #14118

Why we need it and why it was done in this way

• The renderer already special-cases copilot/github and calls formatApiHost(..., false) to avoid adding /v1. The main process built OpenClaw provider URLs differently, causing mismatched endpoints.
• Mirroring the renderer formatting in OpenClawService is minimal, low-risk, and preserves existing behavior for other providers.

The following tradeoffs were made:

• Kept change minimal and targeted to OpenClawService to avoid cross-cutting refactors.

Breaking changes

• None.

Special notes for your reviewer

• Updated file: src/main/services/OpenClawService.ts
• Behavior: only affects how provider apiHost is formatted when syncing OpenClaw config for copilot/github providers.

Checklist

• PR: The PR description is expressive enough.
• Code: Minimal, targeted fix.
• Refactor: N/A
• Upgrade: N/A
• Documentation: N/A (bug fix visible to users)

Release note

Fix: avoid appending `/v1` to GitHub/Copilot provider hosts when syncing OpenClaw config, preventing 404 errors when sending messages with GitHub Copilot models (fixes #14118).

[DeJeune]

LGTM