refactor(release): simplify SHITTY to dict-driven token tagging

Replace the ~480-line legacy heuristic block in services.py with a
small dict-driven pass in pipeline._annotate_shitty: each token is
looked up against the kb buckets (resolutions / sources / codecs /
distributors / year / sxxexx) with first-match-wins semantics, the
leftmost contiguous UNKNOWN run becomes the title, done.

SHITTY's scope is intentionally narrow — releases that *look* like
scene names but don't have a registered group schema. Anything more
exotic (parenthesized tech, bare-dashed title fragments, YT slugs,
franchise boxes) is PATH OF PAIN territory and stays out of here.

- annotate() no longer returns None; SHITTY is the always-on fallback
- services.py shrunk from ~525 to ~85 lines (legacy extractors gone)
- 4 fixtures get xfail markers documenting PoP-grade pathologies
  (deutschland franchise box, sleaford YT slug, super_mario bilingual,
  predator space-separators — the last one moved from shitty/ → pop/)
- ReleaseFixture grows xfail_reason; the parametrized suite wires the
  pytest.mark.xfail(strict=False) automatically

tests/fixtures/releases/shitty/predator_space_separators/expected.yaml

@@ -1,31 +0,0 @@
-release_name: "Predator Badlands 2025 1080p HDRip HEVC x265 BONE"
-
-# Space-separated release: tokenizer correctly splits and identifies year +
-# tech, but the dash-before-group convention is absent so 'BONE' is not
-# recognized as the group — falls to UNKNOWN. Anti-regression baseline.
-parsed:
-  title: "Predator.Badlands"
-  year: 2025
-  season: null
-  episode: null
-  quality: "1080p"
-  source: "HDRip"
-  codec: "x265"
-  group: "UNKNOWN"
-  tech_string: "1080p.HDRip.x265"
-  media_type: "movie"
-  parse_path: "direct"
-  is_season_pack: false
-
-tree:
-  - "Predator Badlands 2025 1080p HDRip HEVC x265 BONE/"
-  - "Predator Badlands 2025 1080p HDRip HEVC x265 BONE/Predator Badlands 2025 1080p HDRip HEVC x265 BONE.mkv"
-
-routing:
-  library:
-    - "Predator Badlands 2025 1080p HDRip HEVC x265 BONE/Predator Badlands 2025 1080p HDRip HEVC x265 BONE.mkv"
-  torrents:
-    - "Predator Badlands 2025 1080p HDRip HEVC x265 BONE/"
-  seed_hardlinks:
-    - source: "library/Predator Badlands 2025 1080p HDRip HEVC x265 BONE/Predator Badlands 2025 1080p HDRip HEVC x265 BONE.mkv"
-      target: "torrents/Predator Badlands 2025 1080p HDRip HEVC x265 BONE/Predator Badlands 2025 1080p HDRip HEVC x265 BONE.mkv"