docs: add Solana integration guide and quickstarts

[igorroncevic]

Description

Document how partners can integrate Solana swaps through the API and SDK, covering sponsored and user-funded orders alongside the existing EVM guides.

Changes

• Add Solana quickstarts and transaction signing examples.
• Explain order creation, expiry, cancellation, tracking, and explorer links.
• Mark EVM-only endpoints and quote streaming.

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Oct 17, 2026 7:51am UTC

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