Fix process-match-result tests: add sportsSeasons to db mock

recalculateAffectedLeagues now queries sportsSeasons to get the sport
name for Discord notifications; the test mock db needed the stub added.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/models/__tests__/process-match-result.test.ts

@@ -46,6 +46,7 @@ function makeDb(existingResult?: { id: string; isPartialScore: boolean }) {
         seasonSports: {
           findMany: vi.fn().mockResolvedValue([]), // empty → standings loop exits immediately
         },
+        sportsSeasons: { findFirst: vi.fn().mockResolvedValue(null) },
         scoringEvents: { findFirst: vi.fn().mockResolvedValue(null) },
       },
     } as any,