[Klaud Cold] Update qwen3.5-fp4-b300-sglang-agentic-mtp SGLang image to nightly-dev-cu13-20260907-30705c00 and move to cluster:b300-dsxe - #2882

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_ae7c133c-fa12-4876-9bd5-c65286bdc78d