Adopt the modern-di integration kit

[lesnik512]

Summary

modern-di 2.28.0 shipped modern_di.integrations — framework-agnostic primitives that formalize what this package's _di_middleware and @inject/FromDI already hand-roll. This swaps the hand-rolled internals for kit calls. No public-API change; zero test-file changes.

Fourth of 13 planned adapter conversions (after starlette 2.2.0, fastapi 2.10.0, litestar 2.13.0).

• _di_middleware keeps its own can_prepare() handshake probe to pick between aiohttp_websocket_provider/aiohttp_request_provider (aiohttp is a documented outlier: both providers bind web.Request, so classify_connection's isinstance dispatch can't tell a WebSocket upgrade from a plain request). Once the provider is picked, integrations.bind(provider, request) derives scope/context, wrapped in Container's async with instead of manual try/finally: close_async().
• _FromDI/_parse_inject_params/_resolve_di_params deleted; FromDI = integrations.from_di; inject now composes integrations.parse_markers/resolve_markers.
• Dead imports (enum, dataclasses, T_co) removed.
• Architecture docs (container-lifecycle.md, dependency-resolution.md, glossary.md) promoted to describe the new internals.
• Bumps the modern-di floor to >=2.28.0,<3.

Test plan

• just test-ci — 100% line coverage, all 10 tests passing, zero test-file changes
• just lint-ci — ruff, ty, check-planning all clean
• Per-task spec + quality review (5 tasks, all approved)
• Whole-branch review (approved, no findings)