[Platform] Fix asynchronous job follow-ups from #2408

[chr-hertel]

Q	A
Bug fix?	no
New feature?	no
Docs?	yes
Issues	-
License	MIT

Follow-ups on #2408, found while reviewing it after the merge. Ships with #2408 in 0.14, so nothing
released changes and no UPGRADE.md entry is added — the existing ones are corrected to describe
what will actually ship.

• MiniMax answers a healthy poll with status_code: 0 and status_msg: "success", which was read as a failure message, so every running job carried "success" in JobStatus::getError(). Verified against the live API.
• A query MiniMax rejects with HTTP 200 carries the reason in base_resp and no state at all, which mapped to UNKNOWN (non-terminal) — the runner then polled it for the whole budget, up to ten minutes for a video handle. It now ends the job, while a state merely spelled in a way the bridge does not know stays non-terminal.
• JobRunner turned the budget into a poll count, so the requests themselves were free: maxDuration: 600 meant 600 requests plus 599 sleeps. It now waits against a clock deadline.
• JobClientInterface::supports() had no caller anywhere; the runner asks before polling.
• MiniMaxResultConverter held a MiniMaxJobClient only to read a name off it, building one with new EventSourceHttpClient() and an empty API key when given none. It takes the name; MiniMaxJobClient::createHandle() and its provider argument go.
• Docs: the autowiring example used $minimaxJobClient, but the registered alias is JobClientInterface $minimax, so it never autowired — checked by compiling a container. Also a nullable getProvider() passed to ContainerInterface::get(), an unassigned $id, and examples using createProvider() where every other MiniMax example uses createPlatform().
• The 0.14 rebase had replaced the CHANGELOG heading underline with == in two files; examples/minimax/.gitignore missed the artifacts the new examples write.

All nine MiniMax examples were run against the live API: async speech (9s, real mp3 out of the tar),
video generation (83s, 792 KB mp4) and the resume flow across four processes from the stored handle.

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