fix(contacts): properties response shape

[gabrielmfern]

GET /contacts/:id returns properties where each entry is a {value, type} object, so the previous Dictionary<string,string> threw JsonException on the real response. Adds ContactPropertyValue (Value: string, number, or boolean; PropertyType reusing ContactPropertyType, with a new Boolean member), retypes Contact.Properties, and covers it via the mock ApiServer + retrieve test. Create/update request params (ContactData.Properties) stay flat maps.

Matches resend-node's get-contact.interface.ts and resend-rust's ContactPropertyResponse.

docs: https://resend.com/docs/api-reference/contacts/get-contact

🤖 Generated with Claude Code

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Summary by cubic

Aligns contact properties deserialization with the API to prevent JsonException. Previously Contact.Properties was Dictionary<string,string>; it is now Dictionary<string, ContactPropertyValue> where each entry has { value: JsonElement, type: ContactPropertyType }.

• Update code that reads properties: var p = contact.Properties["key"]; check p.PropertyType and use p.Value.GetString()/GetBoolean()/GetDouble(). Code assuming Dictionary<string,string> must change.
• Adds ContactPropertyType.Boolean. Create/update payloads are unchanged: ContactData.Properties remains a flat map.

^{Written for commit ad87af2. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 5 files

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[cubic-dev-ai]

0 issues found across 3 files (changes from recent commits).

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Auto-approved: Corrects contact properties deserialization to match the documented API response shape, adding a typed model, a Boolean enum member, and a test that pins the corrected behavior. Focused bug fix with no operational or policy tradeoff.

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