Added provider icons (#934)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Provider/LLMProvidersIconExtensions.cs

@@ -0,0 +1,42 @@
+namespace AIStudio.Provider;
+
+public static class LLMProvidersIconExtensions
+{
+    private const string ICON_ROOT = "/images/provider-icons";
+    private const string SVG_DATA_URL_PREFIX = "data:image/svg+xml;base64,";
+
+    public static string GetIconUrl(this AIStudio.Settings.Provider provider, bool isDarkMode)
+        => provider.UsedLLMProvider.GetIconUrl(isDarkMode, provider.CustomIconDataUrl);
+
+    public static string GetIconUrl(this LLMProviders provider, bool isDarkMode, string? customIconDataUrl)
+    {
+        if (customIconDataUrl?.StartsWith(SVG_DATA_URL_PREFIX, StringComparison.Ordinal) == true)
+            return customIconDataUrl;
+
+        return provider.GetIconUrl(isDarkMode);
+    }
+
+    public static string GetIconUrl(this LLMProviders provider, bool isDarkMode) => provider switch
+    {
+        LLMProviders.NONE => $"{ICON_ROOT}/provider{DarkVariant(isDarkMode)}.svg",
+        LLMProviders.OPEN_AI => $"{ICON_ROOT}/openai{DarkVariant(isDarkMode)}.svg",
+        LLMProviders.ANTHROPIC => $"{ICON_ROOT}/anthropic{DarkVariant(isDarkMode)}.svg",
+        LLMProviders.MISTRAL => $"{ICON_ROOT}/mistral.svg",
+        LLMProviders.GOOGLE => $"{ICON_ROOT}/google.svg",
+        LLMProviders.X => $"{ICON_ROOT}/x{DarkVariant(isDarkMode)}.svg",
+        LLMProviders.DEEP_SEEK => $"{ICON_ROOT}/deepseek.svg",
+        LLMProviders.ALIBABA_CLOUD => $"{ICON_ROOT}/alibaba-cloud.svg",
+        LLMProviders.PERPLEXITY => $"{ICON_ROOT}/perplexity.svg",
+        LLMProviders.OPEN_ROUTER => $"{ICON_ROOT}/openrouter.svg",
+        LLMProviders.HETZNER => $"{ICON_ROOT}/hetzner.svg",
+        LLMProviders.GROQ => $"{ICON_ROOT}/groq.svg",
+        LLMProviders.FIREWORKS => $"{ICON_ROOT}/fireworks.svg",
+        LLMProviders.HUGGINGFACE => $"{ICON_ROOT}/hugging-face.svg",
+        LLMProviders.SELF_HOSTED => $"{ICON_ROOT}/self-hosted{DarkVariant(isDarkMode)}.svg",
+        LLMProviders.HELMHOLTZ => $"{ICON_ROOT}/helmholtz.svg",
+        LLMProviders.GWDG => $"{ICON_ROOT}/gwdg.svg",
+        _ => $"{ICON_ROOT}/provider{DarkVariant(isDarkMode)}.svg",
+    };
+
+    private static string DarkVariant(bool isDarkMode) => isDarkMode ? "-dark" : string.Empty;
+}