story: Split wallet docs into an end-user page and a developer wallet-integration page

[GigaHierz]

Part of #2266.

User story

As a reader, I want to know from the first sentence whether a wallet page is for me as someone who holds CELO, or for me as someone integrating wallets into an app — so I stop landing on the wrong list.

Context & evidence

At bdf40b37 there are two wallet pages with different audiences and overlapping content:

• home/wallets.mdx — end-user list of compatible wallets
• tooling/wallets/index.mdx — ## Celo Native Wallets (MiniPay, Valora, Celo Terminal) plus ## Wallet Infrastructure (line 58) listing 11 developer providers: Privy, Openfort, Alchemy Smart Wallets, thirdweb, Reown, BlockRadar, Para, Safe, Zerion, Portal, JAW

The native-wallet list is duplicated; the rest diverges. tooling/wallets/{metamask,ledger}/* are end-user setup guides living in the developer tab. Wallet content has been moved, split and merged repeatedly; decided: make the audience explicit per page, once.

Acceptance criteria

• One end-user page: native + compatible wallets, links to the MetaMask / Ledger setup guides; the first paragraph says it is for people holding CELO
• One developer "Wallet integration" page holding the 11 providers as a neutral list (thirdweb stays as a plain entry — task: De-promote thirdweb — keep one tool page at parity with other tools, drop code examples and recommendations #2255)
• The native-wallet list exists exactly once; the other page links to it
• Titles and sidebar titles state the audience (e.g. "Wallets for users" / "Wallet integration"; OPEN: exact wording)
• Done in place — no directory moves (story: Learn tab — move home/* (plus kept L1 content) to learn/* #2258 / story: Build tab — merge "Build on Celo" and Tooling into build/*, with Agents and Mini Apps leading #2259 move the files)
• npx mintlify broken-links green

Non-goals

Listing these wallets on the ecosystem site (#2265); the MetaMask image bug #2156 (link, don't fix here).

Depends on / blocks

Depends on #2253 (decides the orphaned tooling/wallets/coinbase-wallet.mdx and tooling/wallets/ledger/eip712-workaround.mdx). Blocks #2258, #2259.

Measured at: bdf40b37