feat: can connect multiple servers (#234)

Fixes #233 

- [x] Updates to Svelte 5 (with a partial migration to runes)
- [x] Update tests
- [x] Fix build warnings
- [x] Fix linter errors
- [ ] ~~Remove unused i18n keys from non-english languages~~
- [x] Update locales for Chinese `zh-cn` and Spanish `es`
- [x] Add new tests

README.md

@@ -5,6 +5,7 @@ A minimal web-UI for talking to [Ollama](https://github.com/jmorganca/ollama/) s
 ### Features
 
 - Support for **Ollama** & **OpenAI** models
+- Multi-server support
 - Large prompt fields
 - Markdown rendering with syntax highlighting
 - Code editor features