feat: 重建加载屏为 DXT1 并清理冗余事件与国家历史

feat(localisation): 加载提示替换为 67 条考据后的历史名言

chore(tooling): tighten docs and prune tests

feat(integration): add merged EU4 content and localization

docs(hub): add dataset card metadata

docs(readme): streamline project overview

feat: establish Ab Integro 0.1.0 baseline