chore(api): bump source-db hit logs to log level for dev verification

Easier to see [source-db hit pcat/emex] lines while dev verifies coverage.
Can be downgraded back to debug once we've measured prod hit rates.

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

apps/api/src/categories/categories.service.ts

@@ -936,7 +936,7 @@ export class CategoriesService {
           // verification can measure source-DB coverage.
           let partsResult = await this.pcatSourceDb.fetchParts(catalogId, carId, groupId);
           if (partsResult) {
-            this.logger.debug(`[source-db hit pcat] car=${carId} group=${groupId}`);
+            this.logger.log(`[source-db hit pcat] car=${carId} group=${groupId}`);
           } else {
             partsResult = await this.partsCatalogsService.fetchParts(
               catalogId,
@@ -1103,7 +1103,7 @@ export class CategoriesService {
             category.externalId,
           );
           if (emexResult) {
-            this.logger.debug(
+            this.logger.log(
               `[source-db hit emex] catalog=${catalogCode} gid=${category.externalId}`,
             );
           } else {