feat(fontconfig): 字体发现 —— 七个生成物全部由 build.mcpp 产出 #992

Job	Run time
graphics install: no side effects on unrelated members	3m 35s
select	13s
lint	14s
mirror-cn-reachable	16s
workspace (linux llvm 0/1)	46s
workspace (windows default 0/1)	2m 25s
workspace (linux default 0/1)	57s
workspace (macos default 0/1)	1m 25s
full sweep failed — open an issue	0s
timings	7s
	9m 58s

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