fix(ovhcloud): stop a diagnostic step from failing the test (1.2.4)

GET /telephony — the list of billing accounts — answers 500 with an empty body on
at least one service account. Nothing in this integration needs that list: it was
added as a diagnostic, and it promptly failed the very test it exists to explain,
hiding whatever the account-scoped routes had to say behind its own failure. It is
now recorded and stepped over.

When neither product can be listed either, the message names what each code means
rather than repeating the status: 403 is an IAM policy missing the telephony
actions, 404 is a billing account that does not exist under these credentials, and
500 on every telephony route means this service account cannot reach the telephony
API at all — for which the way round is an application key from
api.ovh.com/createToken, which this integration already accepts.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TN1R4EnNFUV2Xwtd9q98tj

integrations/ovhcloud/manifest.yaml

@@ -1,8 +1,8 @@
 id: ovhcloud
 name: OVHcloud
-version: 1.2.3
+version: 1.2.4
 description: "OVHcloud (API v1) — cloud account and infrastructure visibility, plus VoIP on-call routing: read the account, list public cloud projects, list/read dedicated servers, and hold Riposte's on-call ladder in a telephony call queue so a client number reaches whoever is on duty without any channel on your own PBX. Signed application-key authentication; stdlib-only, no extra Python dependencies. (French vendor.)"
-changelog: "1.2.3 — The Test button now WALKS to the queue one step at a time and reports what it saw at each: the billing accounts the credentials can reach, the services each product holds, the queues in the one chosen. A bare 404 from this API means a wrong account, a wrong service name, the other product, or a number nobody configured — four jobs, one message — and none of them could be told apart from Riposte. It also answers its own version, because when a test fails identically twice the first question is whether the new code is the code that ran. | 1.2.2 — Find the call queue under either product. OVH files a queue under easyHunting or under ovhPabx depending on the number's offer, and the control panel says \"File d'appels\" for both — so assuming the first answered 404 \"This service does not exist\", which sounds like a wrong number and is in fact a wrong product. The product is now discovered once per run, and a service found under neither says which names DO exist. | 1.2.1 — The Test button now probes what the instance is FOR: with telephony coordinates filled in it reads the call queue, which proves the credentials, the IAM policy, the billing account, the service and the queue at once. It used to read /me unconditionally, so a service account correctly narrowed to /telephony failed its own test with a 403 on account:apiovh:me/get — credentials that were perfect, reported as broken. | 1.2.0 — Accept a SERVICE ACCOUNT (OAuth2 client credentials) as well as the historical application keys, because that is what the control panel offers on accounts where application keys are not available. Which scheme is used is decided by what you filled in, not by a mode selector, and an existing instance keeps working untouched. The API base is corrected to /v1 for a service account, since a Bearer token sent to the legacy /1.0 spelling fails in a way that reads as bad credentials. | 1.1.0 — On-call routing: set_oncall_ladder / get_oncall_ladder / list_calls, backed by a VoIP call queue (easyHunting). Riposte publishes the ordered on-call numbers and the carrier rings them in that order, so an inbound client call never crosses your own trunk and spends no simultaneous call on it. Needs the three telephony_* config fields; every other command is unchanged. | 1.0.0 — Initial release: get account, list cloud projects, list/get dedicated servers."
+changelog: "1.2.4 — The billing-account listing is no longer fatal. On a service account it can answer 500 with an empty body while every account-scoped route underneath works — so the diagnostic step was failing the test it exists to explain, and hiding the answer behind its own failure. When neither product can be listed either, the error now names what each HTTP code means and points at the application-key fallback. | 1.2.3 — The Test button now WALKS to the queue one step at a time and reports what it saw at each: the billing accounts the credentials can reach, the services each product holds, the queues in the one chosen. A bare 404 from this API means a wrong account, a wrong service name, the other product, or a number nobody configured — four jobs, one message — and none of them could be told apart from Riposte. It also answers its own version, because when a test fails identically twice the first question is whether the new code is the code that ran. | 1.2.2 — Find the call queue under either product. OVH files a queue under easyHunting or under ovhPabx depending on the number's offer, and the control panel says \"File d'appels\" for both — so assuming the first answered 404 \"This service does not exist\", which sounds like a wrong number and is in fact a wrong product. The product is now discovered once per run, and a service found under neither says which names DO exist. | 1.2.1 — The Test button now probes what the instance is FOR: with telephony coordinates filled in it reads the call queue, which proves the credentials, the IAM policy, the billing account, the service and the queue at once. It used to read /me unconditionally, so a service account correctly narrowed to /telephony failed its own test with a 403 on account:apiovh:me/get — credentials that were perfect, reported as broken. | 1.2.0 — Accept a SERVICE ACCOUNT (OAuth2 client credentials) as well as the historical application keys, because that is what the control panel offers on accounts where application keys are not available. Which scheme is used is decided by what you filled in, not by a mode selector, and an existing instance keeps working untouched. The API base is corrected to /v1 for a service account, since a Bearer token sent to the legacy /1.0 spelling fails in a way that reads as bad credentials. | 1.1.0 — On-call routing: set_oncall_ladder / get_oncall_ladder / list_calls, backed by a VoIP call queue (easyHunting). Riposte publishes the ordered on-call numbers and the carrier rings them in that order, so an inbound client call never crosses your own trunk and spends no simultaneous call on it. Needs the three telephony_* config fields; every other command is unchanged. | 1.0.0 — Initial release: get account, list cloud projects, list/get dedicated servers."
 category: cloud
 
 # Per-instance configuration. Requests are signed (SHA-1) with the application