fix: support nested MCP header property paths - #1111
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Summary
Why
MCP 2026-07-28 permits statically reachable primitive annotations under plain properties chains. The current top-level-only cache rejects otherwise valid tools.
Specification: https://modelcontextprotocol.io/specification/2026-07-28/basic/transports/streamable-http
Validation
cargo test -p rmcp --lib --features client,transport-streamable-http-client,server-side-http transport::common::mcp_headers::tests
All 36 focused header tests pass.