Content type and archive listing move from files to file_details

Every probe rewrote its file's row on the HDD (content_type, archive):
a new row version on a random page and an entry in each of the five
indexes. They now live in file_details on the NVMe; files rows are
inserted once. files:move-details copies the existing values after
the deploy; a later migration drops the old columns.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/schema.ts

@@ -187,6 +187,17 @@ export class FetchRangeSchema extends BaseModel {
   declare updatedAt: DateTime
 }
 
+export class FileDetailSchema extends BaseModel {
+  static $columns = ['archive', 'contentType', 'fileId'] as const
+  $columns = FileDetailSchema.$columns
+  @column()
+  declare archive: any | null
+  @column()
+  declare contentType: string | null
+  @column({ isPrimary: true })
+  declare fileId: bigint | number
+}
+
 export class FileKeySchema extends BaseModel {
   static $columns = ['keyHash'] as const
   $columns = FileKeySchema.$columns