refactor(release): rename ParsedRelease.normalised → clean

Le champ s'appelait normalised mais ne faisait pas la normalisation
suggérée par son nom (dots instead of spaces). En pratique il contient
raw - site_tag - apostrophes, qui sert uniquement à season_folder_name()
via _strip_episode_from_normalized. Renommé en 'clean' qui décrit ce
qu'il contient réellement, docstring corrigée.

tests/domain/release/test_parser_v2_scoring.py

@@ -67,7 +67,7 @@ def _movie(year: int = 2020, **overrides) -> ParsedRelease:
     """Build a populated movie ParsedRelease for scoring tests."""
     base = dict(
         raw="Inception.2010.1080p.BluRay.x264-GROUP",
-        normalised="Inception.2010.1080p.BluRay.x264-GROUP",
+        clean="Inception.2010.1080p.BluRay.x264-GROUP",
         title="Inception",
         title_sanitized="Inception",
         year=year,
@@ -109,7 +109,7 @@ class TestComputeScore:
     def test_tv_show_gets_season_and_episode_weight(self) -> None:
         parsed = ParsedRelease(
             raw="Oz.S01E01.1080p.WEBRip.x265-KONTRAST",
-            normalised="Oz.S01E01.1080p.WEBRip.x265-KONTRAST",
+            clean="Oz.S01E01.1080p.WEBRip.x265-KONTRAST",
             title="Oz",
             title_sanitized="Oz",
             year=None,
@@ -220,7 +220,7 @@ class TestCollectors:
     def test_collect_missing_critical_full(self) -> None:
         empty = ParsedRelease(
             raw="x",
-            normalised="x",
+            clean="x",
             title="",
             title_sanitized="",
             year=None,