Add Trae SOLO IDE support

[meguoe]

Issue:

cavemem install --ide trae-solo

cavemem error: Unknown --ide trae-solo. Choices: claude-code, gemini-cli, opencode, codex, cursor

Request:
Trae SOLO IDE is a well‑established environment that many developers (myself included) use regularly, alongside tools like codex and gemini-cli. It would be highly valuable if cavemem could add support for Trae SOLO as an IDE option.

Adding this support would:

• Improve compatibility with a widely adopted IDE.
• Streamline workflows for developers already using Trae SOLO.
• Ensure consistency with other supported environments.

[JuliusBrussee]

Status: researched but not shipped in v0.3.0, and here's the honest reason — we could not verify Trae's hook or MCP config schema against its official docs (docs.trae.ai pages render client-side and returned no extractable content to our tooling; secondary sources conflict on both the config path and the mcpServers shape). Every other requested IDE shipped in v0.3.0 (Copilot, Augment full; Antigravity, IBM Bob query-only), so Trae is the one holdout. If you use Trae SOLO and can paste (a) the exact global MCP config file path and (b) a working mcpServers example — and ideally the hook configuration reference content — the installer is a small addition and I'll get it into the next release.