Preserve legacy Mineralogy upgrades on Forge 1.15.2

[SkyBlade1978]

Preserves existing Mineralogy worlds when updating to OreSpawn 4.0.6 on Forge 1.15.2.

• Recognizes saved Mineralogy 1.10, 1.12 and exact 1.15.2/5.1.1 world lineages, including valid level.dat_old metadata.
• Preserves the Cyano engine, exact settings and rock order for generated legacy worlds; existing OreSpawn world profiles remain authoritative and fresh worlds are not reclassified by stale files.
• Writes atomic, idempotent OreSpawn/Mineralogy upgrade reports while leaving source configs and existing chunks unchanged.
• Adds strict runtime-log scanning and a target-native flowing-water fresh/reload gate (300 covered water blocks, stable on reload) without changing production fluid writes.

Validation: 116 tests across 30 suites; fresh/reload surface, biome, geology and dynamic-fluid server gate; 25 structured files; 16 locales with 357 keys; Java 8 clean build, Javadocs, ForgeGradle Eclipse generation and artifact isolation all pass.

No version, API, schema, registry or provider-format change. This is ready for review; the remaining gate is a quick player/UI test before merge.