Add SSR snapshot support for web adapter SSR flows

[schickling]

Summary

• add SSR snapshot helper utilities that reuse the node adapter to produce initial LiveStore state for SSR
• extend the web persisted adapter to accept SSR payloads and seed the client session before workers boot
• update the Redwood TodoMVC example to embed the SSR snapshot, hydrate with it on the client, and expose the payload on the global window object

Testing

• pnpm biome check --write --unsafe

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https://chatgpt.com/codex/tasks/task_e_68f8bd786ab48329a087d3b89d87f22a

[chatgpt-codex-connector]

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