v2 Phase 1: ingestion + SQLite foundation

- Persistence via Node's built-in node:sqlite (zero native deps) on a Docker
  volume: response cache, source health, fixture↔provider id map, per-fixture
  enrichment, ingest log. Runtime bumped to node:24-slim + --experimental-sqlite.
- Resilient fetcher: DB cache + per-source rate-limit + jittered backoff +
  circuit-breaker (blocked sources trip + skip; UI reads DB, never breaks).
- ESPN hidden API as the PRIMARY rich source (works from the VPS where SofaScore
  403s): scoreboard (live scores w/ clock) + summary (venue, H2H, recent form,
  lineups, team stats). football-data / SofaScore are fallbacks.
- Scheduler: maps all 72 group fixtures to ESPN event ids, polls live on a
  dynamic cadence, enriches imminent fixtures into match_ext. /api/sources/health.
- Verified: DB populates (real H2H + form for opening matches), 22 tests pass,
  Docker image runs node:sqlite on the volume and persists across restart.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -7,6 +7,10 @@ server/node_modules
 .DS_Store
 .env
 .env.local
+# local SQLite (dev); prod DB lives on the Docker volume
+/data/cup26.db
+/data/cup26.db-wal
+/data/cup26.db-shm
 # Generated build artifacts (reproduced by `npm run data:build`)
 public/data/fixtures.json
 public/data/ratings.json