docs: add EVM reference section and sei-js examples

[monty-sei]

Summary

• EVM Compatibility page — replaces matrix.mdx; includes feature support table and unsupported RPC methods (blob methods, pending state, eth_accounts)
• Behavior reference sub-pages — finality, gas & fees, transaction types, state proofs, WebSocket subscriptions, signing (all nested under EVM Compatibility as a dropdown in the sidebar)
• 12 sei-js example pages — viem quickstart, ethers v6 quickstart, wagmi + React, ERC-20, ERC-721, ERC-1155, multicall, pointer contracts, precompile redirect, deploy & verify, transaction lifecycle, error handling (under Ecosystem Tutorials → sei-js Examples)
• @sei-js/registry page — new dedicated docs for CHAIN_IDS, NETWORKS, TOKEN_LIST, GAS_INFO, CHAIN_INFO, WALLETS
• Precompiles example-usage rewrite — viem + ethers CodeGroups throughout; Bank, Staking, Distribution, Governance sections; oracle content removed (retired per sei-infra#1001)
• sei-js examples precompiles page — converted to lightweight redirect pointing to the precompiles section
• Navigation — docs.json updated: EVM Compatibility dropdown under Overview, sei-js Examples group under Ecosystem Tutorials; home page and sei-js index updated with new cards

Test plan

• mint dev builds without errors
• EVM Compatibility page renders with dropdown sub-pages in sidebar
• sei-js Examples group appears under Ecosystem Tutorials
• All internal links resolve (no 404s in preview)
• Precompile example-usage page shows viem and ethers tabs
• sei-precompiles example page redirects cleanly to precompiles section
• @sei-js/registry page appears under sei-js Library in sidebar

[mintlify]

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Project	Status	Preview	Updated (UTC)
sei-docs	🟢 Ready	View Preview	May 18, 2026, 4:03 AM

[cursor]

PR Summary

Low Risk
Low risk: documentation-only additions plus sidebar/navigation reshuffling; main risk is broken links or confusing IA changes if paths are wrong.

Overview
Adds a new EVM Compatibility reference section with a compatibility matrix plus focused subpages covering Sei-vs-Ethereum behavior differences (finality, gas/fees, transaction types, state proofs, WebSocket, signing).

Introduces a new sei-js examples tutorial set (viem/ethers/wagmi quickstarts, ERC token interactions, multicall, pointer contracts, deploy/verify, tx lifecycle, error handling) and documents the new @sei-js/registry package.

Updates navigation (docs.json) and entry points (index.mdx, evm/sei-js/index.mdx) to surface the new sections, and rewrites evm/precompiles/example-usage.mdx to use viem+ethers CodeGroups and include the Bank precompile, removing older/retired content.

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