write canonical iso3 language metadata, tighten is_noop, store full jellyfin data

ffmpeg now writes -metadata:s:a:i language=<iso3> on every kept audio track so
files end up with canonical 3-letter tags (en → eng, ger → deu, null → und).
analyzer passes stream.profile (not title) to transcodeTarget so lossless
dts-hd ma in mkv correctly targets flac. is_noop also checks og-is-default and
canonical-language so pipeline-would-change-it cases stop showing as done.

normalizeLanguage gains 2→3 mapping, and mapStream no longer normalizes at
ingest so the raw jellyfin tag survives for the canonical check.

per-item scan work runs in a single db.transaction for large sqlite speedups,
extracted into server/services/rescan.ts so execute.ts can reuse it.

on successful job, execute calls jellyfin /Items/{id}/Refresh, waits for
DateLastRefreshed to change, refetches the item, and upserts it through the
same pipeline; plan flips to done iff the fresh streams satisfy is_noop.

schema wiped + rewritten to carry jellyfin_raw, external_raw, profile,
bit_depth, date_last_refreshed, runtime_ticks, original_title, last_executed_at
— so future scans aren't required to stay correct. user must drop data/*.db.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/services/__tests__/ffmpeg.test.ts

@@ -6,6 +6,7 @@ function stream(o: Partial<MediaStream> & Pick<MediaStream, "id" | "type" | "str
 	return {
 		item_id: 1,
 		codec: null,
+		profile: null,
 		language: null,
 		language_display: null,
 		title: null,
@@ -16,6 +17,7 @@ function stream(o: Partial<MediaStream> & Pick<MediaStream, "id" | "type" | "str
 		channel_layout: null,
 		bit_rate: null,
 		sample_rate: null,
+		bit_depth: null,
 		...o,
 	};
 }
@@ -36,6 +38,7 @@ const ITEM: MediaItem = {
 	jellyfin_id: "x",
 	type: "Movie",
 	name: "Test",
+	original_title: null,
 	series_name: null,
 	series_jellyfin_id: null,
 	season_number: null,
@@ -44,15 +47,20 @@ const ITEM: MediaItem = {
 	file_path: "/movies/Test.mkv",
 	file_size: null,
 	container: "mkv",
+	runtime_ticks: null,
+	date_last_refreshed: null,
 	original_language: "eng",
 	orig_lang_source: "jellyfin",
 	needs_review: 0,
 	imdb_id: null,
 	tmdb_id: null,
 	tvdb_id: null,
+	jellyfin_raw: null,
+	external_raw: null,
 	scan_status: "scanned",
 	scan_error: null,
 	last_scanned_at: null,
+	last_executed_at: null,
 	created_at: "",
 };
 
@@ -155,6 +163,25 @@ describe("buildCommand", () => {
 		expect(cmd).toContain("'/movies/Test.de.srt'");
 	});
 
+	test("writes canonical iso3 language metadata on every kept audio stream", () => {
+		const streams = [
+			stream({ id: 1, type: "Video", stream_index: 0 }),
+			stream({ id: 2, type: "Audio", stream_index: 1, language: "en" }), // 2-letter → eng
+			stream({ id: 3, type: "Audio", stream_index: 2, language: "ger" }), // alias → deu
+			stream({ id: 4, type: "Audio", stream_index: 3, language: null }), // unknown → und
+		];
+		const decisions = [
+			decision({ stream_id: 1, action: "keep", target_index: 0 }),
+			decision({ stream_id: 2, action: "keep", target_index: 0 }),
+			decision({ stream_id: 3, action: "keep", target_index: 1 }),
+			decision({ stream_id: 4, action: "keep", target_index: 2 }),
+		];
+		const cmd = buildCommand(ITEM, streams, decisions);
+		expect(cmd).toContain("-metadata:s:a:0 language=eng");
+		expect(cmd).toContain("-metadata:s:a:1 language=deu");
+		expect(cmd).toContain("-metadata:s:a:2 language=und");
+	});
+
 	test("sets first kept audio as default, clears others", () => {
 		const streams = [
 			stream({ id: 1, type: "Video", stream_index: 0 }),