Search filters for size (MB) and file extensions

- API: min_size and max_size in MB, ext as a comma-separated list. An
  extension matches as a whole word in search_text (file and entry names,
  dots as spaces), so "iso" finds .iso files but not "ISOLATION", which a
  plain search word matched as a substring. The trigram index serves it.
- Web UI: a size range and an extension field in the filter row, kept in
  the URL like the other filters.

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

app/controllers/releases_controller.ts

@@ -3,8 +3,14 @@ import SearchService, { type SortOrder } from '#services/SearchService'
 
 const flag = (value: unknown) => value === '1' || value === 'true' || value === true
 
+/** A size in MB from the query string, as bytes. */
+function megabytes(value: unknown): number | undefined {
+  const mb = Number(value)
+  return value !== undefined && value !== '' && Number.isFinite(mb) && mb >= 0 ? Math.round(mb * 1024 * 1024) : undefined
+}
+
 export default class ReleasesController {
-  /** GET /api/v1/releases?q=&readable=1&complete=1&hide_encrypted=1&source=&poster=&sort=&page=&per_page= */
+  /** GET /api/v1/releases?q=&readable=1&complete=1&hide_encrypted=1&min_size=&max_size=(MB)&ext=mkv,flac&source=&poster=&sort=&page=&per_page= */
   async index({ request }: HttpContext) {
     const qs = request.qs()
     return SearchService.search({
@@ -15,6 +21,9 @@ export default class ReleasesController {
       includePar2Only: flag(qs.par2_only),
       source: typeof qs.source === 'string' && qs.source ? qs.source : undefined,
       poster: typeof qs.poster === 'string' && qs.poster ? qs.poster : undefined,
+      minSize: megabytes(qs.min_size),
+      maxSize: megabytes(qs.max_size),
+      extensions: typeof qs.ext === 'string' && qs.ext ? qs.ext.split(/[\s,]+/) : undefined,
       sort: qs.sort as SortOrder | undefined,
       page: Number(qs.page) || 1,
       perPage: Number(qs.per_page) || 50,