tiviLux V18.2 — League Lock Fix

Fixes:
- NFL and MLB schedule records are now league-locked at the server boundary.
- SportsGamesToday rows are classified by recognized team identities, not nearby HTML headings.
- MLB matchups can no longer be mislabeled as NFL.
- Unrecognized/non-NFL/non-MLB rows are rejected instead of guessed into a league.
- Client adds a second league/source consistency filter before rendering.
- Keeps V18.1 deduplication, numeric PPV sorting, targeted EPG fallback, and mobile fixes.