docs: document extension install-consent and auto-update settings

[ralphstodomingo]

Documents the VS Code extension's install-related settings on the IDE page:

• altimate.codeRequireConsent (default false) — ask before downloading/installing the altimate-code CLI; declining shows manual install instructions. New setting shipping in AltimateAI/vscode-altimate-mcp-server#422.
• altimate.codeAutoUpdate (default true) — existing background auto-update setting, previously undocumented.

Also describes how the extension installs the CLI (HTTPS from GitHub releases, sha256-verified against checksums.txt, into ~/.altimate/bin, no shell scripts) — the transparency detail security-conscious users ask about, and the pre-install/managed-settings escape hatches for controlled environments.

Note: this updates docs.altimate.sh (built from this repo). The help.altimate.ai copy of this page is maintained separately and gets the same section via an internal companion PR.

Merge alongside the extension release that ships #422 — the consent setting doesn't exist in published extensions yet.

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[ralphstodomingo]

Consolidating on the help.altimate.ai copy of this page (maintained separately in the internal docs repo) — that's the site the extension's Documentation button links to. Reopen if docs.altimate.sh should carry the section too.