feat: upgrade to OptiScaler 0.9.4-pre1

[xXJSONDeruloXx]

Summary

Upgrades OptiScaler from 0.9.3 to 0.9.4-pre1 for the 15.7 release build.

Changes in 0.9.4-pre1

• New bundled file:

  • New file in root: amdxcffx64.dll (66.8 MB)
  • This is the FSR4 4.1.1 official driver (was previously downloaded separately, now included)

• Config change:

  • Key Fsr4Model renamed to Fsr4Preset (functionality unchanged)

• Updated: OptiScaler.dll with new build (slightly smaller, new hash)

Files Changed

• main.py - Updated OPTISCALER_ARCHIVE_ASSET with new URL, SHA256, and version
• package.json - Updated remote_binary entry for OptiScaler archive

Verification

• ✅ SHA256 verified: 02b407d69a7372ada6eaa8db2c835e9432a9ec436ffe8eea34eecf9c5f6c240c
• ✅ Archive structure compatible with existing extraction logic
• ✅ All existing scripts (update-optiscaler-config.py, fgmod.sh) remain compatible
• ✅ No breaking changes to plugin patching/unpatching logic

Notes

The archive now includes amdxcffx64.dll which the plugin already handles via variant switching. The existing FSR4 variant logic (rdna4-native, rdna34-official-411) works as-is since the file structure is unchanged.