Polars Python 1.41.2：性能优化与多项修复

🚀 Performance improvements

• Update to new jemalloc (#27797)
• Do not materialize ScalarColumn in Column split_at (#27782)
• Avoid materializing broadcast in array.shift (#27740)
• Avoid materializing broadcast list in list.sample(n) and list.sample(frac) (#27679)

✨ Enhancements

• Update to new jemalloc (#27797)

🐞 Bug fixes

• Broken link to AI Policy corrected (#27793)
• Update to new jemalloc (#27797)

📖 Documentation

• Update Polars On-Prem version stamp (#27799)
• Broken link to AI Policy corrected (#27793)
• Add release dates to the On-Prem releases page (#27787)
• Improve on-prem docs (#27788)
• Add query profiler video to On-Prem user guide (#27786)
• Add EKS/AKS/GKE guides (#27774)
• Add Polars On-Prem 0.4.2 (#27780)

🛠️ Other improvements

• Run Pyrefly on _utils and functions (#27789)
• Harden against async blocking deadlocks (take 2) (#27767)

Thank you to all our contributors for making this release possible!

@ButteryPaws, @EndPositive, @Kevin-Patyk, @MarcoGorelli, @TNieuwdorp, @azimafroozeh, @carnarez, @kdn36, @lun3x, @orlp and @ritchie46