fix(logging): replace console.warn with logger in stars API route

The stars API route used console.warn() for error logging while every
other API route in the codebase uses createLogger from @sim/logger.
This makes warning output from this route invisible to the structured
logging pipeline.

Replaced both console.warn() calls with logger.warn() to match the
pattern used across all other API routes.

Author: badhra-ajaz

apps/sim/app/api/stars/route.ts

@@ -1,6 +1,9 @@
 import { NextResponse } from 'next/server'
+import { createLogger } from '@sim/logger'
 import { env } from '@/lib/core/config/env'
 
+const logger = createLogger('StarsAPI')
+
 function formatStarCount(num: number): string {
   if (num < 1000) return String(num)
   const formatted = (Math.round(num / 100) / 10).toFixed(1)
@@ -22,14 +25,14 @@ export async function GET() {
     })
 
     if (!response.ok) {
-      console.warn('GitHub API request failed:', response.status)
+      logger.warn('GitHub API request failed:', response.status)
       return NextResponse.json({ stars: formatStarCount(19400) })
     }
 
     const data = await response.json()
     return NextResponse.json({ stars: formatStarCount(Number(data?.stargazers_count ?? 19400)) })
   } catch (error) {
-    console.warn('Error fetching GitHub stars:', error)
+    logger.warn('Error fetching GitHub stars:', error)
     return NextResponse.json({ stars: formatStarCount(19400) })
   }
 }