fix(release/parser): recognize Sxx-yy season range as tv_complete

`Der.Tatortreiniger.S01-06.GERMAN...` previously parsed as a movie
with 'S01-06' glued to the title. The parser now matches the
season-range form in _parse_season_episode (returning season=first,
episode=None), and the assemble step detects the range token to
promote media_type to 'tv_complete'.

The first season is exposed as `season` so `is_season_pack`
fires (season is not None and episode is None) — useful for routing
to a series root folder.

Fixture shitty/tatortreiniger_flat_multiseason/ updated:
- title: Der.Tatortreiniger.S01-06 → Der.Tatortreiniger
- season: null → 1
- media_type: movie → tv_complete
- is_season_pack: false → true

CHANGELOG.md

@@ -23,6 +23,12 @@ callers).
   with intermediate values implied. Fixture
   `shitty/archer_multi_episode/` updated from anti-regression-of-bug
   to anti-regression-of-fix.
+- **Season-range markers (`Sxx-yy`) are now recognized as
+  `tv_complete`.** `Der.Tatortreiniger.S01-06.GERMAN...` previously
+  parsed as `media_type=movie` with `S01-06` glued onto the title.
+  The parser now recognizes the range, sets `season=first`,
+  `media_type=tv_complete`, and removes the marker from the title.
+  `is_season_pack` flips to `true`.
 - **Pure-punctuation TITLE tokens are dropped at assembly.** Releases
   with surrounding ` - ` separators (`Vinyl - 1x01 - FHD`) previously
   produced `title="Vinyl.-"`. Such tokens (a stray dash, a wide pipe