feat: tilejson metadata endpoints and tests (#20) (#255) #558

Job	Run time
Detect Non-Test Changes	5s
Build & Format Check	3m 13s
Test Suite (.NET + Python + JS)	6m 49s
JavaScript Integration Tests	2m 8s
AOT Build Verification	3m 27s
Architecture Gate	-1s
LLM Architecture Review	-1s
	15m 40s

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