Update WaaS client and API key handling

[tolgahan-arikan]

Summary

• update the generated WaaS TypeScript client from 0xsequence/waas release commit 892842c46510ffe4c7c68d13f83b29418b6b1a85
• switch the default WaaS API base URL to https://sandbox-api.dev.polygon-dev.technology
• send WaaS publishable keys with the Api-Key header and update the wallet signing preimage for /v1/Waas/*
• require a separate indexerApiKey for Indexer requests and pass it through SDK clients and examples
• update example env templates, docs, and type/test fixtures for the split key configuration

Validation

• pnpm exec vitest run tests/credentialSigner.test.ts tests/walletSigning.test.ts tests/oidcRedirectAuth.test.ts tests/walletTransactions.test.ts
• pnpm exec tsc --noEmit
• pnpm test
• pnpm build
• pnpm build:example
• pnpm build:wagmi-example
• pnpm build:trails-actions-example
• pnpm build:node-example
• pnpm build:node-contract-deploy-example

[claude]

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