fix(chart): use correct AI provider pattern

Use getChatProvider() + provider.getModel() instead of
resolveAiRouteWithTiming which doesn't return a provider function.
Follow the pattern used in chat/insights/route.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

memento-note/app/api/ai/suggest-charts/route.ts

@@ -1,10 +1,9 @@
 import { generateText } from 'ai'
-import { resolveAiRouteWithTiming } from '@/lib/ai/router'
-import { runLaneWithBillingUser, willUseByokForLane } from '@/lib/ai/provider-for-user'
+import { getChatProvider } from '@/lib/ai/factory'
+import { willUseByokForLane } from '@/lib/ai/provider-for-user'
 import { getSystemConfig } from '@/lib/config'
 import { prisma } from '@/lib/prisma'
 import { auth } from '@/auth'
-import { toolRegistry } from '@/lib/ai/tools'
 import { checkEntitlementOrThrow, QuotaExceededError } from '@/lib/entitlements'
 import { trackFeatureUsage } from '@/lib/usage-tracker'
 
@@ -92,12 +91,11 @@ export async function POST(req: Request) {
   console.log('[suggest-charts] analyzeLen:', textToAnalyze.length, 'preview:', textToAnalyze.substring(0, 100))
 
   // 3. Build AI context
-  let sysConfig, provider, model
+  let provider, model
   try {
-    sysConfig = await getSystemConfig()
-    const result = await resolveAiRouteWithTiming('chat', sysConfig)
-    provider = result.provider
-    model = result.model
+    const sysConfig = await getSystemConfig()
+    provider = getChatProvider(sysConfig)
+    model = provider.getModel()
     console.log('[suggest-charts] AI model:', model)
   } catch (e) {
     console.error('[suggest-charts] AI ROUTE ERROR:', e)
@@ -113,7 +111,7 @@ export async function POST(req: Request) {
   try {
     // 4. Call AI to analyze and suggest - direct JSON response (no tool)
     const { text } = await generateText({
-      model: provider(model),
+      model,
       system: `You are a data visualization assistant. Analyze the provided text and suggest appropriate chart types.
 
 IMPORTANT: You MUST respond with valid JSON only. No markdown, no code blocks, no explanations.