Neo Magic Circles - ISAS Addon

- Restored the original mod's config system. magiccircles-client.toml now supports colorOverwrites, circleTypeOverwrites, and all offset settings, matching the original mod's config format so existing configs drop in directly.

- Fixed magic circles rendering solid black without shaders. The non-shader render path was feeding the lightmap the wrong coordinate scale (a leftover from the 1.20.1 → 1.21.1 API migration), sampling near the darkest corner of the lightmap texture instead of full brightness. Circles now show their correct school color with or without shaders.

- Internal logger was still using the old incorrect name.