fix: 8 AI services were not using configured provider

CRITICAL FIX: Auto-labels, notebook summaries, and other AI features
were not working because 8 services were calling getAIProvider() WITHOUT
passing the config parameter.

This caused them to use the default 'ollama' provider instead of
the configured OpenAI provider from the database.

ROOT CAUSE ANALYSIS:
Working features (titles):
- title-suggestions/route.ts: getAIProvider(config) ✓

Broken features (auto-labels, summaries):
- contextual-auto-tag.service.ts: getAIProvider() ✗ (2x)
- notebook-summary.service.ts: getAIProvider() ✗
- auto-label-creation.service.ts: getAIProvider() ✗
- notebook-suggestion.service.ts: getAIProvider() ✗
- batch-organization.service.ts: getAIProvider() ✗
- embedding.service.ts: getAIProvider() ✗ (2x)

FIXED: All 8 services now properly call:
  const config = await getSystemConfig()
  const provider = getAIProvider(config)

This ensures ALL AI features use the provider configured in the admin
interface (OpenAI) instead of defaulting to Ollama.

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

keep-notes/lib/ai/services/embedding.service.ts

@@ -5,6 +5,7 @@
  */
 
 import { getAIProvider } from '../factory'
+import { getSystemConfig } from '@/lib/config'
 
 export interface EmbeddingResult {
   embedding: number[]
@@ -28,7 +29,8 @@ export class EmbeddingService {
     }
 
     try {
-      const provider = getAIProvider()
+      const config = await getSystemConfig()
+      const provider = getAIProvider(config)
 
       // Use the existing getEmbeddings method from AIProvider
       const embedding = await provider.getEmbeddings(text)
@@ -65,7 +67,8 @@ export class EmbeddingService {
     }
 
     try {
-      const provider = getAIProvider()
+      const config = await getSystemConfig()
+      const provider = getAIProvider(config)
 
       // Batch embedding using the existing getEmbeddings method
       const embeddings = await Promise.all(