feat!: upgrade rmcp SDK from 0.16 to 1.x

[nazq]

Summary

• Upgrade rmcp SDK from 0.16 to 1.x — all model structs migrated from struct literals to ::new() + .with_*() builder pattern (#[non_exhaustive])
• ProtocolVersion::LATEST is 2025-06-18 in rmcp 1.x (SDK hasn't added 2025-11-25 yet — our docs reference the current MCP spec 2025-11-25)
• Filed upstream fix for #[task_handler] macro deprecated type aliases (rust-sdk#727)
• Net -77 lines — builders are more concise than struct literals

Changes

Area	What changed
Cargo.toml	rmcp 0.16 → 1.1
src/server.rs	ServerInfo, ServerCapabilities, CompleteResult → builders; StreamableHttpServerConfig gains json_response field
src/prompts/templates.rs	Prompt, PromptArgument, PromptMessage → builders
src/prompts/mod.rs	GetPromptResult → builder
src/resources/mod.rs	ListResourcesResult, ListResourceTemplatesResult, ReadResourceResult → builders
tests/	ReadResourceRequestParams, SubscribeRequestParams, PaginatedRequestParams → builders
CHANGELOG.md	Added [Unreleased] entry for rmcp 1.x migration
README.md	Added (rmcp 1.x SDK) to features

Test plan

• 175 unit/integration tests pass
• Clippy clean (zero warnings)
• Verified with local patched rmcp-macros — zero deprecation warnings after upstream PR merges
• Validated against upstream rust-sdk full test suite (fmt, clippy -D warnings, cargo test --all-features)

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 90.32258% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.49%. Comparing base (b99d883) to head (e4df127).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/prompts/mod.rs	0.00%	5 Missing ⚠️
src/server.rs	82.35%	3 Missing ⚠️
src/resources/mod.rs	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
- Coverage   86.86%   86.49%   -0.37%     
==========================================
  Files          12       12              
  Lines        2117     2022      -95     
==========================================
- Hits         1839     1749      -90     
+ Misses        278      273       -5     

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