feat: integrate the Chat modality with the shared Rust core

[pgherveou]

Summary

• add immutable App and Chat execution contexts with generated execution filtering
• make custom-message rendering a typed request/response stream while keeping existing Chat subscriptions one-way
• add connection-scoped Chat state, native ProductRuntime controls, and the optional ChatPlatform adapter
• expose typed native renderer trees through Swift, Kotlin, and generated TrUAPI bindings
• add a Chat-only playground worker, diagnosis reporting, explorer results, and local iOS launch workflows
• document the shared-core Chat protocol and product integration

Host drafts

• iOS: https://github.com/paritytech/polkadot-app-ios-v2/pull/1310
• dotli: refactor(host): adopt the shared Rust TrUAPI runtime dotli-community#136

Validation

• cargo test -p truapi-server --all-features
• cargo test -p truapi-codegen
• cargo clippy for truapi-server and truapi-codegen with warnings denied
• full code generation with nightly-2026-01-10
• @parity/truapi: 208 tests and TypeScript build
• playground lint, typecheck, and unit tests
• TrUAPIHost Swift package build
• Chat diagnosis report and iOS launcher script checks
• dotli workspace typecheck and lint

Notes

The three PRs are drafts because the protocol and both host integrations should be reviewed together.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​vite@​8.2.0
	npm/​@​parity/​truapi@​0.5.1 ⏵ 0.0.0	+20		+1	+4

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