[model gateway][0/N] router EPD support: add encoder grpc server backend support (#16552)

Co-authored-by: Zongyao Chen <ZongYao.Chen@linux.alibaba.com>
Co-authored-by: Zongyao Chen <solar1s@163.com>

python/sglang/launch_server.py

@@ -13,14 +13,21 @@ suppress_noisy_warnings()
 
 def run_server(server_args):
     """Run the server based on server_args.grpc_mode and server_args.encoder_only."""
-    if server_args.grpc_mode:
+    if server_args.encoder_only:
+        if server_args.grpc_mode:
+            from sglang.srt.disaggregation.encode_grpc_server import (
+                serve_grpc_encoder,
+            )
+
+            asyncio.run(serve_grpc_encoder(server_args))
+        else:
+            from sglang.srt.disaggregation.encode_server import launch_server
+
+            launch_server(server_args)
+    elif server_args.grpc_mode:
         from sglang.srt.entrypoints.grpc_server import serve_grpc
 
         asyncio.run(serve_grpc(server_args))
-    elif server_args.encoder_only:
-        from sglang.srt.disaggregation.encode_server import launch_server
-
-        launch_server(server_args)
     else:
         # Default mode: HTTP mode.
         from sglang.srt.entrypoints.http_server import launch_server