feat: migrate from RapidAPI to TheSportsDB with SvelteKit dashboard

- Replace free-api-live-football-data (RapidAPI) backend with TheSportsDB
- Add PostgreSQL cache layer for permanent data (teams, players, leagues, events)
- Replace Bootstrap dashboard with SvelteKit-based interactive dashboard
- Restructure MCP tools around TheSportsDB capabilities (get_team_info, get_roster, get_fixtures, get_standings, etc.)
- Expose tool registry via GET /api/tools so dashboard stays in sync
- Remove legacy modules and references (api_football, sync, RapidAPI env vars)

.env.example

@@ -24,7 +24,3 @@ NIKE_TRUSTED_PROXY=*
 # ── Followed teams ────────────────────────────────────────
 # Comma-separated list of "Team Name:League Name" pairs.
 NIKE_TEAMS=Toronto FC:MLS, Arsenal:Premier League
-
-# ── Legacy (not active) ───────────────────────────────────
-# NIKE_RAPIDAPI_KEY=
-# NIKE_API_FOOTBALL_KEY=