[Feature] Add MiniCPM-SALA support (#30360)

Co-authored-by: Alex Nails <alex.nails@radixark.ai>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

python/sglang/srt/server_args.py

@@ -201,6 +201,8 @@ ATTENTION_BACKEND_CHOICES = [
     "trtllm_mha",
     "dual_chunk_flash_attn",
     "hpc_ops",  # HPC-Ops (https://github.com/Tencent/hpc-ops), Hopper (SM90) only, requires --page-size 64
+    "minicpm_flashattn",
+    "minicpm_flashinfer",
     # AMD specific
     "aiter",
     "wave",
@@ -969,7 +971,12 @@ class ServerArgs:
         NS("schedule"),
     ] = False
     disable_radix_cache: A[
-        bool, "Disable RadixAttention for prefix caching.", NS("memory")
+        bool,
+        Arg(
+            help="Disable RadixAttention for prefix caching.",
+            resolvable=True,
+        ),
+        NS("memory"),
     ] = False
     enable_page_major_kv_layout: A[
         bool,