fix: correct LongCat API base URL path

open-sse/config/providerRegistry.ts

@@ -1275,10 +1275,7 @@ export const REGISTRY: Record<string, RegistryEntry> = {
     alias: "lc",
     format: "openai",
     executor: "default",
-    // (#536) Correct OpenAI-compatible base URL — was longcat.chat/api/v1/chat/completions
-    // which is the chat endpoint directly, not the base. Key validation and routing must
-    // use https://api.longcat.chat/openai which resolves /v1/models and /v1/chat/completions
-    baseUrl: "https://api.longcat.chat/openai",
+    baseUrl: "https://api.longcat.chat/openai/v1/chat/completions",
     authType: "apikey",
     authHeader: "Authorization",
     authPrefix: "Bearer",

src/lib/providers/validation.ts

@@ -655,7 +655,7 @@ export async function validateProviderApiKey({ provider, apiKey, providerSpecifi
     // LongCat AI — does not expose /v1/models; validate via chat completions directly (#592)
     longcat: async ({ apiKey }: any) => {
       try {
-        const res = await fetch("https://longcat.chat/api/v1/chat/completions", {
+        const res = await fetch("https://api.longcat.chat/openai/v1/chat/completions", {
           method: "POST",
           headers: buildBearerHeaders(apiKey),
           body: JSON.stringify({