Add logging for OpenAI fallback

src/main/kotlin/com/android/trisolarisserver/component/DocumentExtractionService.kt

@@ -8,6 +8,7 @@ import com.android.trisolarisserver.repo.GuestVehicleRepo
 import com.android.trisolarisserver.repo.PropertyRepo
 import java.time.OffsetDateTime
 import java.util.UUID
+import org.slf4j.LoggerFactory
 
 @org.springframework.stereotype.Component
 class DocumentExtractionService(
@@ -17,6 +18,8 @@ class DocumentExtractionService(
     private val guestVehicleRepo: GuestVehicleRepo,
     private val propertyRepo: PropertyRepo
 ) {
+    private val logger = LoggerFactory.getLogger(DocumentExtractionService::class.java)
+
     fun extractAndApply(localImageUrl: String, publicImageUrl: String, document: GuestDocument, propertyId: UUID): ExtractionResult {
         val results = linkedMapOf<String, String>()
         val detections = listOf(
@@ -289,11 +292,13 @@ class DocumentExtractionService(
             return
         }
 
+        logger.info("Aadhaar retry failed; using OpenAI fallback")
         val fallback = openAIVisionClient.extractAadhaarNumber(publicImageUrl) ?: ""
         val fallbackNormalized = normalizeDigits(cleanedValue(fallback))
         if (fallbackNormalized != null && isValidAadhaar(fallbackNormalized)) {
             results[key] = formatAadhaar(fallbackNormalized)
         } else {
+            logger.warn("OpenAI fallback failed to produce valid Aadhaar")
             results[key] = "NONE"
         }
     }