[Cherry-pick to release/v0.5.15] [DSA] Fix top-k v2 emitting invalid indices under tie overflow / inf scores (IMA in FA3 sparse decode) (#30645) - #30698

[Cherry-pick to release/v0.5.15] [DSA] Fix top-k v2 emitting invalid indices under tie overflow / inf scores (IMA in FA3 sparse decode) (#30645)#30698

Fridge003 merged 1 commit into

release/v0.5.15sgl-project/sglang:release/v0.5.15from

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