FORK-ONLY. Drops the moment `extra_headers` lands upstream and aionrs cuts a
tag — at which point this goes back to `tag = "v0.2.11+"` and nothing else in
the tree changes.

The attribution commit that follows needs `TransportCompat::extra_headers`,
which v0.2.11 does not have, so without this the next commit does not build.
Kept separate and first so every commit in this branch compiles on its own and
the feature commit stays reviewable as the change it actually is.

Upstream PR: aimlapi/aionrs-aimlapi#1

Conversations never carried attribution. The desktop client sets `HTTP-Referer`
and `X-Title` in `ClientFactory.ts`, but the only thing routed through that
code is the built-in image-generation MCP server — chat and model listing go
through this crate and out via aionrs, which until now wrote authorization and
content type and nothing else. So the headers existed and reached almost no
traffic.

`resolve_aionrs_url_and_compat_with_mode` now resolves the four attribution
headers when the configured base URL is AI/ML API's, and both places that
apply compat overrides (`manager::aionrs::agent` and `services::provider_health`)
carry them into the aionrs config. They extend rather than assign, so a preset
that already carries headers keeps them.

The host match is exact, mirroring `is_openai_host` beside it. That matters
more than it looks: AI/ML API serves a request with a wrong or missing partner
id normally and simply attributes it to nobody, so every failure mode here is
silent. A substring match would hand our partner id to whoever registers
`api.aimlapi.com.example.test`, and nothing at runtime would say so. Hence
tests for the near-misses rather than only for the hit, and a test asserting
the id still matches the gateway's `^part_[A-Za-z0-9]{1,64}$`.

The `is_full_url` early return is covered too — a user who pasted a complete
endpoint is still talking to the same host, and that path exits before the
rest of the compat work.

Verified: 1005 tests in `aionui-ai-agent` pass. Removing the one line that
sets the headers, with the tests kept, fails exactly the two that assert they
are sent and leaves the three that assert they are NOT sent elsewhere passing
— which is what those should do.

Generated by the dependency repoint two commits back, and drops with it.

…s is merged

feat(aionrs): attribute AI/ML API traffic on the wire