Replace Conditional with Polymorphism from the Refactoring Guru catalog.
The OpenWebUIProvider previously contained two parallel implementations
(completeWithChat / completeWithOllama, streamWithChat / streamWithOllama,
plus branching in validateConnection) selected by a `useOllamaProxy`
boolean. The 987-line file is split into:
- openwebui-types.ts wire-format response types
- openwebui-http.ts shared HTTP client (auth, timeout)
- openwebui-strategies.ts OpenWebUIStrategy interface plus
OpenWebUIChatStrategy and
OpenWebUIOllamaStrategy implementations
- openwebui.ts thin provider that picks one strategy at
construction and delegates
OpenWebUIProvider and OpenWebUIConfig (including useOllamaProxy) stay
in their original locations, so consumer imports are unchanged.
Side effects:
- Error mapping now goes through the base mapProviderError / providerErrorMessages
hooks added in R2, removing handleOpenWebUIError and its duplicated status switch.
- providerInfo.version bumped to 2.0.0 to reflect the rewrite.
