Align docs examples to DeFi flows: swaps, deposits, mints, and quests

[yosriady]

Motivation

• Update documentation examples to reflect DeFi-focused user flows (swaps, deposits, mints, quests) instead of generic e‑commerce/button examples.
• Make reserved analytics properties (e.g., volume, revenue, points) and event property examples clearer for crypto apps.

Description

• Replaced generic examples across the docs with DeFi-specific examples such as Swap Completed, Swap Started, Deposit, NFT Minted, and Quest Completed in data, features, and sdks pages.
• Updated sample payloads and .track() snippets to include DeFi properties like pair, token_in, token_out, amount_in, amount_out, volume, and revenue.
• Adjusted event naming guidance and metadata examples to use swap-related fields (e.g., pair=ETH/USDC).
• Files changed include data/concepts.mdx, data/events/track.mdx, data/metrics.mdx, features/product-analytics/custom-events.mdx, sdks/mobile.mdx, sdks/server.mdx, and sdks/web.mdx with corresponding snippet and example updates.

Testing

• Built the documentation site with npm run build to validate rendered pages and the build completed successfully.
• Ran Markdown/Docs linting with npm run lint:md and the lint checks passed.

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Codex Task

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