⚡ Bolt: [performance improvement] Add early loop termination in group creation

[google-labs-jules]

💡 What: Added early loop termination (break) in grabNextAvailablePlayer when bestScore === 0.
🎯 Why: In group formation, a score of 0 represents the absolute best possible outcome (no prior grouping penalty). Continuing the loop to check remaining players wastes CPU cycles since no better candidate can be found.
📊 Impact: Skips unnecessary iterations and reduces computation time in hot group-creation loops when an optimal player is found early.
🔬 Measurement: Verify correctness by ensuring that the generated groups remain identical, and use a benchmark script on createMythicPlusGroups with a high number of iterations and players to observe lower execution times. Tested via npm -w packages/shared run test and npm -w activity run typecheck.

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PR created automatically by Jules for task 10414264255176948250 started by @TytaniumDev

[google-labs-jules]

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