dsv4-fp4-b300-sglang-agentic-hicache-mtp: restore MegaMoE FP4 acts, retarget to cluster:b300-dsxe / 恢复 MegaMoE FP4 激活路径，并迁移至 cluster:b300-dsxe - #2878

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

Request ID: serverGenReqId_00fb0009-9607-4465-875e-997df271e322