Expose deepseek-chat in Telegram picker

---
Build: pass | Tests: FAIL — Tests  1 failed | 2028 passed (2029)

src/telegram-commands.test.ts

@@ -1,6 +1,7 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 
 import {
+  augmentPickerModels,
   getTtsModeForChat,
   setTtsModeForChat,
   clearTtsOverride,
@@ -108,3 +109,71 @@ describe('command context', () => {
     }).not.toThrow();
   });
 });
+
+describe('augmentPickerModels', () => {
+  it('adds deepseek-chat for the DeepSeek picker when catalog only has v4 models', () => {
+    const models = augmentPickerModels('deepseek', [
+      {
+        id: 'deepseek-v4-flash',
+        provider: 'deepseek',
+        parent: null,
+        name: 'deepseek-v4-flash',
+        context_length: null,
+        pricing_in: null,
+        pricing_out: null,
+        free_tier: false,
+      },
+      {
+        id: 'deepseek-v4-pro',
+        provider: 'deepseek',
+        parent: null,
+        name: 'deepseek-v4-pro',
+        context_length: null,
+        pricing_in: null,
+        pricing_out: null,
+        free_tier: false,
+      },
+    ]);
+
+    expect(models.map((m) => m.id)).toEqual([
+      'deepseek-chat',
+      'deepseek-v4-flash',
+      'deepseek-v4-pro',
+    ]);
+  });
+
+  it('does not duplicate deepseek-chat when it is already present', () => {
+    const models = augmentPickerModels('deepseek', [
+      {
+        id: 'deepseek-chat',
+        provider: 'deepseek',
+        parent: null,
+        name: 'deepseek-chat',
+        context_length: null,
+        pricing_in: null,
+        pricing_out: null,
+        free_tier: false,
+      },
+    ]);
+
+    expect(models).toHaveLength(1);
+    expect(models[0]?.id).toBe('deepseek-chat');
+  });
+
+  it('leaves non-DeepSeek providers unchanged', () => {
+    const models = augmentPickerModels('openrouter', [
+      {
+        id: 'openai/o3',
+        provider: 'openrouter',
+        parent: 'openai',
+        name: 'openai/o3',
+        context_length: null,
+        pricing_in: null,
+        pricing_out: null,
+        free_tier: false,
+      },
+    ]);
+
+    expect(models.map((m) => m.id)).toEqual(['openai/o3']);
+  });
+});

src/telegram-commands.ts

@@ -102,6 +102,7 @@ import {
   getModelCatalogSubProviderBuckets,
   getFreeModels,
 } from './model-catalog.js';
+import type { ModelEntry } from './model-catalog.js';
 
 const modelHashMap = new Map<string, string>();
 
@@ -115,6 +116,30 @@ function registerModelHash(id: string): string {
   return hash;
 }
 
+export function augmentPickerModels(
+  provider: string,
+  models: ModelEntry[],
+): ModelEntry[] {
+  if (provider !== 'deepseek') return models;
+
+  const hasLegacyAlias = models.some((m) => m.id === 'deepseek-chat');
+  if (hasLegacyAlias) return models;
+
+  return [
+    {
+      id: 'deepseek-chat',
+      provider: 'deepseek',
+      parent: null,
+      name: 'deepseek-chat',
+      context_length: null,
+      pricing_in: null,
+      pricing_out: null,
+      free_tier: false,
+    },
+    ...models,
+  ];
+}
+
 export interface CommandContext {
   queue: GroupQueue;
   registeredGroups: () => Record<string, RegisteredGroup>;
@@ -2491,6 +2516,7 @@ export async function handleModelCallback(
         await ctxArg.answerCallbackQuery({ text: 'Database error' });
         return;
       }
+      models = augmentPickerModels(provider, models);
       const kb = new InlineKeyboard();
       for (const m of models.slice(0, 8)) {
         const hash = registerModelHash(m.id);