Jan-Marlon Leibl 3d985a95a8 refactor: split OpenWebUI into strategy classes by backend ...

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.

2026-05-21 13:51:08 +02:00

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