feat: add domain reads

[AlexanderNZ]

I added the missing domain read endpoints so MCP can pull domain data, not just write it.

What I changed

• added list/get domain reads for /landscapes/{landscapeId}/versions/{versionId}/domains
• added formatting for domain output

Why I did it

• domain IDs show up in model objects, so read support fills a real gap

Notes

• depends on the refactor in PR refactor: remove teams support and harden tests #23

Test plan

• not run

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Note

Medium Risk
Introduces a new, more feature-complete IcePanel API client (timeouts/retries/env validation) plus new MCP domain tools; behavior changes in request handling and error/retry logic could affect integrations if this client replaces prior callers.

Overview
Adds a new src/services/icepanel-client.ts IcePanel API client with validated ICEPANEL_API_BASE_URL, configurable timeouts/retries, exponential backoff for retryable GET/HEAD failures, and a structured IcePanelApiError + handleApiError helper.

Introduces MCP domain tooling via registerDomainTools (icepanel_list_domains with optional fuzzy search/pagination, plus icepanel_get_domain/create/update/delete_domain) and extends src/types.ts with domain/tag entities and request/response types for model object/connection/tag/domain CRUD, while tightening unions for ModelObject.status/type and adding ModelConnectionResponse.

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Recommended merge order

• PR refactor: reduce filter param duplication #19 (filter refactor)
• PR feat: add HTTP transport (Streamable HTTP) #20 (HTTP transport)
• PR feat: add Docker support #21 (Docker support)
• PR feat: add IcePanel write tools #22 (write tools)
• PR refactor: remove teams support and harden tests #23 (refactor + tests)
• PR feat: add tag and tag group reads #24 (tags + tag groups)
• PR feat: add domain reads #25 (domains)
• PR feat: add connection reads #26 (connections)
• PR feat: add diagram reads #27 (diagrams)
• PR feat: add flow reads #28 (flows)
• PR feat: add model object export reads #29 (model object exports)
• PR docs: expand read tools and tests #30 (docs + tests)