feat(tournament): add Swiss-system tournament module

Implements the full tournament lifecycle: create, join, withdraw, start,
round progression, and finish with Buchholz tiebreak standings.

- REST resource covering all 11 endpoints from the OpenAPI spec
- Swiss pairing algorithm with bye support
- Per-bot NDJSON stream with targeted gameStart events (color field)
- Game result ingestion via Redis writeback stream
- H2-backed integration tests for resource and pairing service

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

modules/tournament/src/main/resources/keys/public.pem

@@ -0,0 +1,9 @@
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+WQIDAQAB
+-----END PUBLIC KEY-----