Add OpenRouter chat provider; fix Windows load errors (0.17.0).

- OpenRouter as an alternative chat provider: server-side API key
  (settings.json or OPENROUTER_API_KEY), model list with vision marks and
  filter, SSE streaming, images as data URLs. Memory embeddings stay on Ollama;
  park/warm LLM are no-ops for the remote provider.
- AssistentSaveKnowledgeAttach: JArray param is not supported by SwarmUI API
  reflection and aborted registration of every later API call; use string[].
- SQLite bootstrap: preload native e_sqlite3 for the current OS/arch
  (win/osx/linux) and resolve DllImport to it.
- settings.json: shared-read + atomic write with retry to avoid Windows
  sharing violations.
- csproj: fix MSB4012 in the native SQLite copy target.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

AssistentVram.cs

@@ -26,6 +26,10 @@ public partial class SwarmAssistentExtension
         {
             return new JObject { ["error"] = "model is required" };
         }
+        if (UseOpenRouter())
+        {
+            return new JObject { ["success"] = true, ["parked"] = false, ["skipped"] = "remote provider" };
+        }
         if (LooksLikeEmbedModel(name))
         {
             return new JObject { ["success"] = true, ["parked"] = false, ["skipped"] = "memory model — never parked" };
@@ -80,6 +84,11 @@ public partial class SwarmAssistentExtension
         {
             return new JObject { ["error"] = "model is required" };
         }
+        if (UseOpenRouter())
+        {
+            // Remote model is always "resident" — lets the UI clear its cold-load flag.
+            return new JObject { ["success"] = true, ["warmed"] = true, ["skipped"] = "already_resident", ["model"] = name };
+        }
         if (LooksLikeEmbedModel(name))
         {
             return new JObject { ["success"] = true, ["warmed"] = false, ["skipped"] = "memory model" };