docs: update switch examples for model bindings

[joohw]

Summary

• Update public landing, llms, skill markdown, and blog examples to use explicit vendor/model switch bindings instead of vendor-only profile arguments.
• Fix the Kimi agent page command flag from kimi-cli to kimi-code while keeping the existing slug for URL compatibility.
• Refresh the related desktop README reference to the same switch syntax.

Test plan

• npm install in landing/
• npm run lint (fails on pre-existing landing/src/components/Aurora.tsx react-hooks/refs issue)
• npx eslint src/lib/guides-data.ts src/lib/seo-data.ts src/lib/skill-markdown.ts src/components/home/hero.tsx src/components/agents/agent-guide-content.tsx
• repo-wide script check: no vendor-only positional clovapi switch --cli ... <name> examples remain
• searched for stale --cli kimi-cli / cliFlag: "kimi-cli"

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