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"
         }
     }

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

@@ -7,6 +7,7 @@ import org.springframework.http.HttpHeaders
 import org.springframework.http.MediaType
 import org.springframework.stereotype.Component
 import org.springframework.web.client.RestTemplate
+import org.slf4j.LoggerFactory
 
 @Component
 class OpenAIVisionClient(
@@ -19,8 +20,13 @@ class OpenAIVisionClient(
     @Value("\${openai.model:gpt-5-mini}")
     private val model: String
 ) {
+    private val logger = LoggerFactory.getLogger(OpenAIVisionClient::class.java)
+
     fun extractAadhaarNumber(imageUrl: String): String? {
-        if (apiKey.isBlank()) return null
+        if (apiKey.isBlank()) {
+            logger.warn("OpenAI fallback skipped: openai.apiKey is blank")
+            return null
+        }
 
         val payload = mapOf(
             "model" to model,
@@ -45,6 +51,8 @@ class OpenAIVisionClient(
         headers.contentType = MediaType.APPLICATION_JSON
         headers.setBearerAuth(apiKey)
         val entity = HttpEntity(payload, headers)
+        return try {
+            logger.info("OpenAI fallback request model={} url={}", model, baseUrl)
             val response = restTemplate.postForEntity(baseUrl, entity, String::class.java)
             val body = response.body ?: return null
             val node = objectMapper.readTree(body)
@@ -60,6 +68,10 @@ class OpenAIVisionClient(
                     if (text.isNotBlank()) return text
                 }
             }
-        return null
+            null
+        } catch (e: Exception) {
+            logger.warn("OpenAI fallback failed: {}", e.message)
+            null
+        }
     }
 }