feat(03-02): add MLS to canonicalization pipeline

- Import MLS_TEAMS from mls module
- Add MLS_DIVISIONS dict (Eastern/Western conferences)
- Add MLS to sport_mappings for team canonicalization
- Add MLS team abbreviation aliases (LA, NYC, RBNY, etc.)
- Add MLS stadium historical aliases (BMO, PayPal Park, Shell Energy, etc.)

Total teams: 154 (30 MLS teams added)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Scripts/canonicalize_games.py

@@ -97,6 +97,18 @@ TEAM_ABBREV_ALIASES = {
     ('NFL', 'TAM'): 'team_nfl_tb',    # Tampa Bay alternate
     ('NFL', 'SFO'): 'team_nfl_sf',    # San Francisco alternate
     ('NFL', 'WAS'): 'team_nfl_was',   # Washington (direct match but include for completeness)
+
+    # MLS
+    ('MLS', 'LA'): 'team_mls_lag',     # LA Galaxy
+    ('MLS', 'NYC'): 'team_mls_nycfc',  # NYC FC
+    ('MLS', 'RBNY'): 'team_mls_nyrb',  # NY Red Bulls
+    ('MLS', 'NYR'): 'team_mls_nyrb',   # NY Red Bulls alt
+    ('MLS', 'SJE'): 'team_mls_sj',     # San Jose Earthquakes
+    ('MLS', 'KC'): 'team_mls_skc',     # Sporting KC
+    ('MLS', 'DCU'): 'team_mls_dc',     # DC United
+    ('MLS', 'FCD'): 'team_mls_dal',    # FC Dallas
+    ('MLS', 'MON'): 'team_mls_mtl',    # Montreal
+    ('MLS', 'LAF'): 'team_mls_lafc',   # LAFC alt
 }