feat(mcp): lazy-resolve Sombra customer URL via GraphQL

[dawson-turechek-transcend]

Summary

• Lazy-resolve Sombra customer ingress via GraphQL (organization.sombra.customerUrl) when SOMBRA_URL is unset
• Add optional SOMBRA_CUSTOMER_KEY / X-Sombra-Authorization support
• Wire MCP servers and docs off the multi-tenant default; sticky host resolve once per client

Part of GitHub Stack #337. Merge the top PR (#336) to land the whole stack atomically.

Test plan

• Unit tests for resolveSombraUrl / lazy TranscendRestClient host resolve
• Confirm MCP boots without SOMBRA_URL and resolves customer URL with a valid API key
• Confirm SOMBRA_URL override still sticks and skips GraphQL host lookup

[pkg-pr-new]

Open in StackBlitz

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commit: eead24d