server: improve tools, remove apply_diff (#25498)

* server: improve tools, remove apply_diff

* improve edit tool

* add tools_io abstraction

* add tools_io_basic

* fix build

* move utils to class member

* add const

tools/server/tests/utils.py

@@ -113,6 +113,7 @@ class ServerProcess:
     ui_mcp_proxy: bool = False
     backend_sampling: bool = False
     gcp_compat: bool = False
+    server_tools: str | None = None
 
     # session variables
     process: subprocess.Popen | None = None
@@ -256,6 +257,8 @@ class ServerProcess:
             server_args.append("--no-cache-idle-slots")
         if self.ui_mcp_proxy:
             server_args.append("--ui-mcp-proxy")
+        if self.server_tools:
+            server_args.extend(["--tools", self.server_tools])
         if self.backend_sampling:
             server_args.append("--backend_sampling")
         if self.gcp_compat: