feat: Add Anthropic Compatible provider support

- Added support for 'anthropic-compatible' provider nodes in backend.
- Implemented isAnthropicCompatible logic in open-sse for /messages URL construction and headers.
- Added UI for creating and managing Anthropic Compatible providers in the dashboard.
- Updated validation logic for Anthropic-compatible endpoints.
- Sanitize base URL input (strip trailing /messages) to prevent 404s and improve UX.
- Improve validation: use GET /models (2xx success), and support x-api-key / Authorization Bearer hybrid proxies.
- Enable model import via /models for Anthropic Compatible providers.
- Ensure Authorization is omitted when x-api-key is present to avoid strict proxy conflicts.
- Resolve Anthropic-compatible credentials by prefix during model resolution (e.g., acx/model).
- Update default executor to match provider header/url behavior for Anthropic-compatible providers.

src/sse/services/model.js

@@ -20,10 +20,18 @@ export async function getModelInfo(modelStr) {
 
   if (!parsed.isAlias) {
     if (parsed.provider === parsed.providerAlias) {
-      const providerNodes = await getProviderNodes({ type: "openai-compatible" });
-      const matchedNode = providerNodes.find((node) => node.prefix === parsed.providerAlias);
-      if (matchedNode) {
-        return { provider: matchedNode.id, model: parsed.model };
+      // Check OpenAI Compatible nodes
+      const openaiNodes = await getProviderNodes({ type: "openai-compatible" });
+      const matchedOpenAI = openaiNodes.find((node) => node.prefix === parsed.providerAlias);
+      if (matchedOpenAI) {
+        return { provider: matchedOpenAI.id, model: parsed.model };
+      }
+
+      // Check Anthropic Compatible nodes
+      const anthropicNodes = await getProviderNodes({ type: "anthropic-compatible" });
+      const matchedAnthropic = anthropicNodes.find((node) => node.prefix === parsed.providerAlias);
+      if (matchedAnthropic) {
+        return { provider: matchedAnthropic.id, model: parsed.model };
       }
     }
     return {