Add persisted webchat conversations and extract initial API client package

docs/design-docs/api-client-package-followup.md

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+# API Client Package Follow-up
+
+The first extraction of `@spacebot/api-client` is intentionally light.
+
+It creates a reusable package boundary for Spacedrive and other consumers, but it still re-exports generated types from `interface/src/api/`.
+
+## Follow-up Work
+
+### 1. Make `spacebot/interface` consume `@spacebot/api-client`
+
+The Spacebot interface should stop importing from its local `src/api/*` modules directly and instead consume the shared package.
+
+That will make the package the single source of truth for:
+
+- OpenAPI client setup
+- generated schema types
+- friendly exported types
+- manual SSE event types
+
+### 2. Move OpenAPI generation output into the package
+
+The long-term target is for `schema.d.ts` to be generated directly into `packages/api-client/` instead of `interface/src/api/`.
+
+That will let the shared package fully own the generated contract and avoid the current re-export bridge.
+
+## Why Deferred
+
+These steps are worth doing, but they are not required for the first Spacedrive integration slice.
+
+For now, the package boundary exists, and Spacedrive can start consuming it immediately.