Add support for OPENAI_LIKE_API_MODELS

Define OPENAI_LIKE_API_MODELS=path/to/model1:limit;path/to/model2:limit;path/to/model3:limit
Helps construct model list when the endpoint does not support /models/ request.

app/lib/modules/llm/providers/openai-like.ts

@@ -10,10 +10,47 @@ export default class OpenAILikeProvider extends BaseProvider {
   config = {
     baseUrlKey: 'OPENAI_LIKE_API_BASE_URL',
     apiTokenKey: 'OPENAI_LIKE_API_KEY',
+    modelKey: 'OPENAI_LIKE_API_MODELS',
   };
 
   staticModels: ModelInfo[] = [];
 
+  getEnvDefinedModels(serverEnv: Record<string, string> = {}): ModelInfo[] {
+    const models = serverEnv[this.config.modelKey] || process.env[this.config.modelKey];
+    console.debug(`${this.name}: ${this.config.modelKey}=${models}`);
+
+    const mklabel = (model: string) => {
+      let parts = model.split('/').reverse() || [];
+      parts = parts.filter((p) => p && !p.includes('accounts') && !p.includes('models'));
+
+      let label = parts.join('-');
+
+      if (parts.length >= 2) {
+        label = `${parts.shift()} (${parts.join(', ')})`;
+      }
+
+      return label.toLowerCase().replace(/\b\w/g, (match) => match.toUpperCase());
+    };
+
+    const ret =
+      models?.split(';').map((model) => {
+        const parts = model.split(':');
+        const name = (parts.length && parts.shift()?.trim()) || 'parse-error';
+        const ret = {
+          name,
+          label: mklabel(name),
+          provider: this.name,
+          maxTokenAllowed: parseInt(parts.shift() || '0'),
+        };
+
+        return ret;
+      }) || [];
+
+    console.debug(`${this.name}: Parsed Models: `, ...ret);
+
+    return ret;
+  }
+
   async getDynamicModels(
     apiKeys?: Record<string, string>,
     settings?: IProviderSetting,
@@ -34,17 +71,29 @@ export default class OpenAILikeProvider extends BaseProvider {
     const response = await fetch(`${baseUrl}/models`, {
       headers: {
         Authorization: `Bearer ${apiKey}`,
+        ContentType: 'application/json',
       },
     });
 
-    const res = (await response.json()) as any;
+    let ret = [];
 
-    return res.data.map((model: any) => ({
+    try {
+      const json = (await response.json()) as any;
+      ret = json.data.map((model: any) => ({
         name: model.id,
         label: model.id,
         provider: this.name,
         maxTokenAllowed: 8000,
       }));
+    } catch {
+      if (response.headers.has('x-error-message')) {
+        const xerr = response.headers.get('x-error-message');
+        console.debug(`${this.name}: ${xerr}`);
+        ret = this.getEnvDefinedModels(serverEnv);
+      }
+    }
+
+    return ret;
   }
 
   getModelInstance(options: {