Make Smart Search library-aware (Emby dedup + TV gap-fill)

New controller/library.js queries Emby by TMDB provider id (resilient: an
unreachable Emby degrades to "unknown" so search still works).

Movies — quality-aware dedup:
- findReleases checks movieInLibrary(tmdbId) and flags each option alreadyOwned
  when its resolution is <= what you already own, so only genuine upgrades are
  offered; the release picker greys owned qualities and shows a library banner.

TV — library-driven "fill the gaps":
- GET /__api/search/seasons compares Emby's episode inventory against TMDB's
  per-season episode counts to mark each season complete/partial/missing.
- POST /__api/search/fill picks the best complete-season pack (LLM) for every
  missing/incomplete season and queues them. Front-end routes TV titles to a
  season plan + "Fill all gaps" instead of the movie release list.

Adds tmdb.tmdbSeasons; shared tmdb module import in search.js.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

controller/library.js

@@ -0,0 +1,69 @@
+'use strict';
+
+const conf = require('>/conf');
+
+// Resolution rank so we can compare "what you own" against a candidate release.
+function rankFromWidth(w){
+	w = Number(w) || 0;
+	if(w >= 3000) return 4; // 4k
+	if(w >= 1700) return 3; // 1080p
+	if(w >= 1000) return 2; // 720p
+	if(w > 0) return 1;     // sd
+	return 0;
+}
+
+function rankFromLabel(label){
+	label = String(label || '').toLowerCase();
+	if(/2160|4k|uhd/.test(label)) return 4;
+	if(label.includes('1080')) return 3;
+	if(label.includes('720')) return 2;
+	if(label.includes('480')) return 1;
+	return 0;
+}
+
+function labelFromRank(rank){ return ['', '480p', '720p', '1080p', '4k'][rank] || ''; }
+
+async function embyGet(pathAndQuery){
+	let sep = pathAndQuery.includes('?') ? '&' : '?';
+	let res = await fetch(`${conf.emby.url}${pathAndQuery}${sep}api_key=${conf.emby.apiKey}`);
+	if(!res.ok) throw new Error(`Emby ${res.status}`);
+	return await res.json();
+}
+
+// Is this movie already in the library, and at what best quality? Never throws — an
+// unreachable Emby just means "unknown", so search still works.
+async function movieInLibrary(tmdbId){
+	try{
+		let data = await embyGet(`/Items?Recursive=true&IncludeItemTypes=Movie&AnyProviderIdEquals=tmdb.${tmdbId}&Fields=Width`);
+		let items = data.Items || [];
+		if(!items.length) return { owned: false, rank: 0, quality: '' };
+		let rank = Math.max(...items.map(i => rankFromWidth(i.Width)));
+		return { owned: true, rank, quality: labelFromRank(rank), count: items.length };
+	}catch(error){
+		return { owned: false, rank: 0, quality: '', unknown: true };
+	}
+}
+
+// Which episodes of a series are already present, grouped by season( season -> count).
+async function seriesInventory(tmdbId){
+	try{
+		let s = await embyGet(`/Items?Recursive=true&IncludeItemTypes=Series&AnyProviderIdEquals=tmdb.${tmdbId}&Fields=ProviderIds`);
+		let series = (s.Items || [])[0];
+		if(!series) return { owned: false, have: {} };
+
+		let ep = await embyGet(`/Shows/${series.Id}/Episodes`);
+		let sets = {};
+		for(let e of ep.Items || []){
+			let sn = e.ParentIndexNumber, en = e.IndexNumber;
+			if(sn == null || en == null || sn === 0) continue; // skip specials
+			(sets[sn] = sets[sn] || new Set()).add(en);
+		}
+		let have = {};
+		for(let sn of Object.keys(sets)) have[sn] = sets[sn].size;
+		return { owned: true, seriesId: series.Id, have };
+	}catch(error){
+		return { owned: false, have: {}, unknown: true };
+	}
+}
+
+module.exports = { movieInLibrary, seriesInventory, rankFromWidth, rankFromLabel, labelFromRank };