/docs command and config doc links point to wrong domain

[anandgupta42]

Problem

The "Open docs" command in the TUI (/docs via command palette) opens https://altimate.ai/docs, which is not the project's documentation site. The actual docs live at https://docs.altimate.sh (per README.md, docs/docs/CNAME, and docs/mkdocs.yml).

The same wrong domain is used in several other user-visible places:

• packages/opencode/src/cli/cmd/tui/app.tsx — "Open docs" command opens altimate.ai/docs
• packages/opencode/src/config/config.ts — command and agent schema descriptions reference altimate.ai/docs/...; precedence-order comment too
• packages/opencode/src/cli/cmd/providers.ts — Cloudflare AI Gateway help text links to altimate.ai/docs/providers/...
• packages/opencode/src/session/prompt/anthropic.txt — Anthropic system prompt tells the model to fetch altimate.ai/docs
• packages/sdk/openapi.json + generated SDK types — same wrong descriptions

Additionally, the rewritten paths (/commands, /agents, /providers, etc.) don't exist at the docs root — they live under /configure/... (e.g. https://docs.altimate.sh/configure/commands/).

Expected behaviour

All references should point to the canonical docs site https://docs.altimate.sh with the correct paths under /configure/, and each link should return HTTP 200.

Verified target paths (all return 200)

• https://docs.altimate.sh
• https://docs.altimate.sh/configure/config/
• https://docs.altimate.sh/configure/commands/
• https://docs.altimate.sh/configure/agents/
• https://docs.altimate.sh/configure/providers/