feat(relay): hosted-tool conversion fidelity, reasoning normalization, and billing usage integrity (#7137)

* feat(relaykit): preserve hosted tools across conversions

- add protocol-neutral hosted-tool DTOs, conversion metadata, and loss policies
- bridge citations, grounding metadata, and hosted-tool stream lifecycles
- document the public conversion behavior and channel policy controls

* refactor(relaykit): normalize reasoning and thinking intent

- centralize provider-neutral reasoning intent, effort, and budget mappings
- parse model suffixes at the host entry boundary while preserving provider-owned tails
- keep adaptive Claude thinking and explicit zero-token compatibility consistent

* fix(billing): preserve authoritative usage across relay hops

- carry native BillingUsage sidecars through direct and streamed protocol bridges
- merge partial and terminal usage monotonically with safe fallback settlement
- retain cache metadata, penultimate usage, and per-call Gemini tool surcharges

* feat(relay): bridge Responses with Claude and Gemini protocols

- add direct request, response, and stream converters across supported relay formats
- expose Claude count_tokens and Chat-to-Responses compatibility endpoints
- carry conversion diagnostics through the host while retaining the curated public goldens

* fix(relay): wire relaykit conversions into host channels

- connect handlers, adaptors, and channel settings to the standalone conversion layer
- keep model mapping, pricing identity, retries, and provider-specific suffix behavior aligned
- ignore local audit artifacts and retain focused public regression coverage

controller/channel-test.go

@@ -259,6 +259,13 @@ func testChannel(ctx context.Context, channel *model.Channel, testUserID int, te
 			newAPIError: types.NewError(err, types.ErrorCodeChannelModelMappedError),
 		}
 	}
+	if err = helper.ApplyReasoningModelSuffix(info, request); err != nil {
+		return testResult{
+			context:     c,
+			localErr:    err,
+			newAPIError: types.NewErrorWithStatusCode(err, types.ErrorCodeConvertRequestFailed, http.StatusBadRequest, types.ErrOptionWithSkipRetry()),
+		}
+	}
 
 	testModel = info.UpstreamModelName
 	// 更新请求中的模型名称
@@ -943,7 +950,7 @@ func testChannelForHealthCheck(ctx context.Context, channel *model.Channel, test
 	}
 
 	if allowDisable && isChannelEnabled && shouldBanChannel && channel.GetAutoBan() {
-		processChannelError(result.context, *types.NewChannelError(channel.Id, channel.Type, channel.Name, channel.ChannelInfo.IsMultiKey, common.GetContextKeyString(result.context, constant.ContextKeyChannelKey), channel.GetAutoBan()), newAPIError)
+		processChannelError(result.context, *types.NewChannelError(channel.Id, channel.Type, channel.Name, channel.ChannelInfo.IsMultiKey, common.GetContextKeyString(result.context, constant.ContextKeyChannelKey), channel.GetAutoBan()), newAPIError, nil)
 		summary.Disabled++
 	}