test: add Playwright tests and debug endpoint for AI provider validation

Add comprehensive tests to verify AI provider configuration and ensure
OpenAI is being used correctly instead of hardcoded Ollama.

Changes:
- Add ai-provider.spec.ts: Playwright tests for AI provider validation
- Add /api/debug/config endpoint: Exposes AI configuration for testing
- Tests verify: OpenAI config, connectivity, no OLLAMA errors

All 4 tests pass locally:
✓ AI provider configuration check
✓ OpenAI connectivity test
✓ Embeddings provider verification
✓ No OLLAMA errors validation

Usage on Docker:
TEST_URL=http://192.168.1.190:3000 npx playwright test ai-provider.spec.ts

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

keep-notes/tests/ai-provider.spec.ts

@@ -0,0 +1,92 @@
+import { test, expect } from '@playwright/test';
+
+// Use localhost for local testing, can be overridden with env var
+const BASE_URL = process.env.TEST_URL || 'http://localhost:3000';
+
+test.describe('AI Provider Configuration Tests', () => {
+  test('should check AI provider configuration in database', async ({ page }) => {
+    // This test checks the debug endpoint we created
+    const response = await page.request.get(`${BASE_URL}/api/debug/config`);
+
+    expect(response.status()).toBe(200);
+
+    const config = await response.json();
+    console.log('AI Configuration:', config);
+
+    // Verify OpenAI is configured
+    expect(config.AI_PROVIDER_TAGS).toBe('openai');
+    expect(config.AI_PROVIDER_EMBEDDING).toBe('openai');
+    expect(config.AI_MODEL_TAGS).toBeTruthy();
+    expect(config.AI_MODEL_EMBEDDING).toBeTruthy();
+    expect(config.OPENAI_API_KEY).toContain('set');
+  });
+
+  test('should test OpenAI provider connectivity', async ({ page }) => {
+    const response = await page.request.get(`${BASE_URL}/api/ai/test`);
+
+    expect(response.status()).toBe(200);
+
+    const result = await response.json();
+    console.log('AI Test Result:', result);
+
+    // Should indicate success with OpenAI
+    expect(result.success).toBe(true);
+    expect(result.tagsProvider).toBe('openai');
+    expect(result.embeddingsProvider).toBe('openai');
+    expect(result.embeddingLength).toBeGreaterThan(0);
+  });
+
+  test('should check embeddings provider via main test endpoint', async ({ page }) => {
+    // The /api/ai/test endpoint already tests both tags and embeddings providers
+    const response = await page.request.get(`${BASE_URL}/api/ai/test`);
+
+    expect(response.status()).toBe(200);
+
+    const result = await response.json();
+    console.log('Embeddings via AI Test:', result);
+
+    // Verify embeddings provider is working
+    expect(result.embeddingsProvider).toBe('openai');
+    expect(result.embeddingLength).toBe(1536); // OpenAI text-embedding-3-small
+    expect(result.details?.provider).toBe('OpenAI');
+  });
+
+  test('should verify no OLLAMA errors in provider', async ({ page }) => {
+    // Test the AI test endpoint to ensure it's using OpenAI, not Ollama
+    const response = await page.request.get(`${BASE_URL}/api/ai/test`);
+
+    expect(response.status()).toBe(200);
+
+    const result = await response.json();
+    const resultStr = JSON.stringify(result);
+
+    // Should not contain OLLAMA references
+    expect(resultStr).not.toContain('OLLAMA');
+    expect(resultStr).not.toContain('ECONNREFUSED');
+    expect(resultStr).not.toContain('127.0.0.1:11434');
+
+    // Should contain OpenAI references
+    expect(resultStr).toContain('openai');
+  });
+});
+
+test.describe('AI Provider - Docker Deployment Tests', () => {
+  test.beforeAll(async () => {
+    // Skip these tests if not testing against Docker
+    test.skip(!process.env.TEST_URL?.includes('192.168'), 'Skipping Docker tests - set TEST_URL=http://192.168.1.190:3000');
+  });
+
+  test('should verify paragraph refactor service uses OpenAI', async ({ page }) => {
+    // This test verifies that the refactor service uses the configured provider
+    // instead of hardcoding Ollama
+    const response = await page.request.get(`${BASE_URL}/api/ai/test`);
+
+    expect(response.status()).toBe(200);
+
+    const result = await response.json();
+
+    // Verify the tags provider is OpenAI (this is what refactor uses)
+    expect(result.tagsProvider).toBe('openai');
+    expect(result.details?.provider).toBe('OpenAI');
+  });
+});