docs(release): add 2.1.0 notes (modern-di 2.25 integration seams)

planning/releases/2.1.0.md

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+# modern-di-starlette 2.1.0 — adopt modern-di 2.25 integration seams
+
+Internal refactor, no API change. Swaps the two reach-into-modern-di-internals
+spots for the blessed integration seams added in
+[modern-di 2.25.0](https://github.com/modern-python/modern-di/releases/tag/2.25.0)
+(see [modern-python/modern-di#283](https://github.com/modern-python/modern-di/pull/283)).
+
+## Internal
+
+- `setup_di` now registers the connection providers via
+  `container.add_providers(...)` instead of reaching into
+  `container.providers_registry`.
+- `FromDI` resolution now dispatches through `container.resolve_dependency(dep)`
+  instead of an `isinstance`-on-`AbstractProvider` check reimplemented locally.
+- `architecture/dependency-resolution.md` updated to describe the
+  `resolve_dependency` seam.
+
+## Packaging
+
+- Bumps the `modern-di` floor to `>=2.25.0,<3`.
+
+## Downstream
+
+No action needed — the public API (`setup_di`, `FromDI`, `@inject`,
+`fetch_di_container`, `starlette_request_provider`/`starlette_websocket_provider`)
+is unchanged. Upgrading only requires `modern-di>=2.25.0`.
+
+## Internals
+
+- 100% line coverage; `ruff`, `ty` clean across Python 3.10–3.14.