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>

AssistentOllama.cs

@@ -21,6 +21,11 @@ public partial class SwarmAssistentExtension
     public async Task<JObject> AssistentListModels(Session session, string baseUrl)
     {
         string root = NormalizeBaseUrl(baseUrl);
+        return UseOpenRouter() ? await ListOpenRouterModels(root) : await ListOllamaModels(root);
+    }
+
+    async Task<JObject> ListOllamaModels(string root)
+    {
         try
         {
             using HttpResponseMessage resp = await HttpClient.GetAsync($"{root}/api/tags");
@@ -104,6 +109,7 @@ public partial class SwarmAssistentExtension
             return new JObject
             {
                 ["success"] = true,
+                ["provider"] = ProviderOllama,
                 ["base_url"] = root,
                 ["models"] = models,
                 ["memory_models"] = memoryModels,
@@ -363,7 +369,7 @@ public partial class SwarmAssistentExtension
         }
         catch (Exception ex)
         {
-            return new JObject { ["error"] = $"Ollama chat failed: {ex.Message}" };
+            return new JObject { ["error"] = $"{ProviderLabel()} chat failed: {ex.Message}" };
         }
     }
 
@@ -388,7 +394,7 @@ public partial class SwarmAssistentExtension
                 await ws.SendJson(new JObject
                 {
                     ["phase"] = "waiting_ollama",
-                    ["notice"] = "Waiting for Ollama…",
+                    ["notice"] = $"Waiting for {ProviderLabel()}…",
                 }, API.WebsocketTimeout);
             }
             async Task OnDelta(string delta)
@@ -435,7 +441,7 @@ public partial class SwarmAssistentExtension
         }
         catch (Exception ex)
         {
-            await ws.SendJson(new JObject { ["error"] = $"Ollama chat failed: {ex.Message}" }, API.WebsocketTimeout);
+            await ws.SendJson(new JObject { ["error"] = $"{ProviderLabel()} chat failed: {ex.Message}" }, API.WebsocketTimeout);
         }
         return null;
     }