fix: resolve 11 P1 bugs from audit (leaderboard, SQL, coop, jump, lifecycle, schematics, config)
- leaderboard: parse M:SS.mmm/H:MM:SS(.mmm), switch TIME sort to long (п.25)
- sql: single Hikari pool, non-blocking connect, adaptive init order, settings JSON round-trip (п.27-30)
- coop: remove unregister recursion via session-only leave + reentrancy guard (п.24)
- jump: perpendicular jitter for diagonal heading, valid safety-fallback on retry exhaustion (п.32-33)
- lifecycle: fall threshold relative to course, lead via generated-blocks counter, one-time rewards once (п.35-37)
- schematics: catch RuntimeExceptions, validate size, 10MB file limit (п.31)
- config merge: preserve block-sequence lists and ignored sections, fix path reversal (п.26)
- tests: +31 (score, jump, schematics, config merge) = 72 total
loki5512344
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