Allow canvas noise overrides for temporary profiles

[anhtahaylove]

Summary

• Accept a noise object on POST /profiles/temporary instead of silently ignoring it.
• Keep seed: 0 behavior so temporary profile noise is derived from the generated profile id.
• Document the field in OpenAPI and expose it through the MCP temporary-profile helper.
• Add a CDP smoke script that creates two temporary canvas-noise profiles and fails if their canvas hashes match.

Fixes #11.

Tests

• cargo test --manifest-path src-tauri\Cargo.toml --lib temporary_profile_
• node --check mcp\index.js
• node --check scripts\smoke-canvas-noise.mjs
• npm run build
• git diff --check

Note: the live smoke script is intended to run after building/installing this branch, with SHARDX_TOKEN available and the Launcher API running.