[Kernel] Migrate DSA + DSV4 attention kernels to sglang.kernels (RFC #29630, Phase 2.5, 5/7) (#30792)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

python/sglang/test/kits/attention_unittest/attention_methods/dsa_attention.py

@@ -1145,7 +1145,7 @@ def dsa_impl_capability(impl: str) -> tuple[bool, str]:
 
     if impl == "tilelang":
         try:
-            from sglang.srt.layers.attention.dsa.tilelang_kernel import (  # noqa: F401
+            from sglang.kernels.ops.attention.dsa.tilelang_kernel import (  # noqa: F401
                 tilelang_sparse_fwd,
             )
         except ImportError as exc:

python/sglang/test/kits/attention_unittest/attention_methods/dsv4_attention.py

@@ -19,12 +19,12 @@ from typing import Any
 import torch
 from torch import nn
 
+from sglang.kernels.ops.attention.dsv4.quant_k_cache import (
+    quant_to_nope_fp8_rope_bf16_pack_triton,
+)
 from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.environ import envs
 from sglang.srt.layers.attention.attention_registry import ATTENTION_BACKENDS
-from sglang.srt.layers.attention.dsv4.quant_k_cache import (
-    quant_to_nope_fp8_rope_bf16_pack_triton,
-)
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.mem_cache.deepseek_v4_memory_pool import DeepSeekV4TokenToKVPool
 from sglang.srt.mem_cache.memory_pool import ReqToTokenPool