feat: add OllamaLocalExecutor and update provider handling

- Introduced OllamaLocalExecutor to handle requests for the "ollama-local" provider.
- Removed the direct URL construction for "ollama-local" from BaseExecutor.
- Updated index.js to include the new OllamaLocalExecutor in the executors mapping.
- Enhanced the ProvidersPage component to support dynamic addition of OpenAI/Anthropic compatible providers.

open-sse/executors/base.js

@@ -1,5 +1,4 @@
 import { HTTP_STATUS, RETRY_CONFIG, DEFAULT_RETRY_CONFIG, resolveRetryEntry } from "../config/runtimeConfig.js";
-import { resolveOllamaLocalHost } from "../config/providers.js";
 import { proxyAwareFetch } from "../utils/proxyFetch.js";
 
 /**
@@ -36,9 +35,6 @@ export class BaseExecutor {
       const normalized = baseUrl.replace(/\/$/, "");
       return `${normalized}/messages`;
     }
-    if (this.provider === "ollama-local") {
-      return `${resolveOllamaLocalHost(credentials)}/api/chat`;
-    }
     const baseUrls = this.getBaseUrls();
     return baseUrls[urlIndex] || baseUrls[0] || this.config.baseUrl;
   }