fix(devserver): memory-conscious GC profile for the Hot Reload host

The dev-server host is a long-running background daemon on the developer's
machine, but inherited the Microsoft.NET.Sdk.Web default (Server GC), which is
throughput-oriented and retains committed memory. Under Hot Reload each emit
allocates tens of MB of transient garbage; Server GC feels no pressure to
collect it, so RSS climbs into multi-GB over a session.

Align the host GC profile with a memory-conscious background daemon:
- ServerGarbageCollection=false + ConcurrentGarbageCollection=true (Workstation
  background GC: pressure applied early, transient garbage collected).
- runtimeconfig.template.json: System.GC.ConserveMemory=5 (compact heap +
  decommit to OS), HeapHardLimitPercent=66 (relative last-resort ceiling),
  HighMemoryPercent=70 (react earlier under machine memory pressure).

Fixes #24203

Author: devid-bot

src/Uno.UI.RemoteControl.Host/Uno.UI.RemoteControl.Host.csproj

@@ -8,6 +8,12 @@
 		<Nullable>enable</Nullable>
 		<NoWarn>$(NoWarn);VSTHRD200</NoWarn>
 		<DefineConstants>$(DefineConstants);IS_DEVSERVER</DefineConstants>
+
+		<!-- The dev-server is a long-running background daemon on the developer's machine.
+		     The default Web SDK profile (Server GC) is throughput-oriented and retains committed
+		     memory; switch to a memory-conscious Workstation profile instead. See #24203. -->
+		<ServerGarbageCollection>false</ServerGarbageCollection>
+		<ConcurrentGarbageCollection>true</ConcurrentGarbageCollection>
 	</PropertyGroup>
 
 	<Import Project="../targetframework-override-noplatform.props" />
@@ -99,4 +105,12 @@
 	<Target Name="GetTargetPath" />
 	<Target Name="GetCopyToPublishDirectoryItems" />
 
+
+	<ItemGroup>
+		<!-- runtimeconfig.template.json is a build-time input merged into the generated
+		     Uno.UI.RemoteControl.Host.runtimeconfig.json; it must not be copied to output
+		     nor packed. See #24203. -->
+		<Content Remove="runtimeconfig.template.json" />
+	</ItemGroup>
+
 </Project>

src/Uno.UI.RemoteControl.Host/runtimeconfig.template.json

@@ -0,0 +1,7 @@
+{
+  "configProperties": {
+    "System.GC.ConserveMemory": 5,
+    "System.GC.HeapHardLimitPercent": 66,
+    "System.GC.HighMemoryPercent": 70
+  }
+}