move the PD bootstrap registry under api_server::disaggregation (#33895)

rust/Cargo.lock

@@ -120,6 +120,15 @@ version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1"
 
+[[package]]
+name = "arc-swap"
+version = "1.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c049c0be4daef0b145cb3555416b3b8ef5b7888a38aea1a3a155801fe7b0810b"
+dependencies = [
+ "rustversion",
+]
+
 [[package]]
 name = "arg_enum_proc_macro"
 version = "0.3.4"
@@ -3688,6 +3697,7 @@ dependencies = [
 name = "sglang-server"
 version = "0.1.0"
 dependencies = [
+ "arc-swap",
  "async-stream",
  "axum 0.8.9",
  "bytemuck",