🤖 fix: VS Code extension uses oRPC server when available

[ThomasK33]

What

• VS Code extension now discovers a running mux server via MUX_SERVER_URL or ~/.mux/server.lock and uses HTTP oRPC for workspace listing/activity.
• Falls back to the existing file-based metadata when no server is detected.
• If a server is detected but unreachable, prompts the user to retry or explicitly opt into using local files (to avoid silently racing the server).
• Uses backend-computed namedWorkspacePath for opening workspaces (local/worktree + SSH).

Validation

• make static-check
• cd vscode && bun run compile

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Generated with mux • Model: openai:gpt-5.2 • Thinking: xhigh

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