feat: Gemini als Provider hinzugefügt (Free-Tier-Modelle hardcodiert)

- OpenAiService: Gemini-Provider mit Base-URL generativelanguage.googleapis.com/v1beta/openai
- GeminiApiKey aus IConfiguration (appsettings.json / appsettings.Production.json)
- Gemini Free-Tier-Modelle hardcodiert: 2.5 Pro, 2.5 Flash, 2.5 Flash Lite
- ModelsEndpoint: /api/models/gemini Endpoint
- Frontend: geminiOptgroup dynamisch befüllt
- ProviderKeys als static HashSet (für ChatService.ResolveModelId)

Endpoints/ModelsEndpoint.cs

@@ -12,6 +12,7 @@ public static class ModelsEndpoint
     {
         app.MapGet("/api/models/nvidia",       HandleNvidiaModels);
         app.MapGet("/api/models/pollinations", HandlePollinationsModels);
+        app.MapGet("/api/models/gemini",       HandleGeminiModels);
     }
 
     private static IResult HandleNvidiaModels(OpenAiService openAiService)
@@ -29,4 +30,12 @@ public static class ModelsEndpoint
             .ToList();
         return Results.Json(new { models });
     }
+
+    private static IResult HandleGeminiModels(OpenAiService openAiService)
+    {
+        var models = openAiService.GetGeminiModels()
+            .Select(m => new { id = m.Id, displayName = m.DisplayName })
+            .ToList();
+        return Results.Json(new { models });
+    }
 }

Program.cs

@@ -70,7 +70,7 @@ builder.Services.AddSingleton<AnthropicService>(sp =>
 
 // OpenAI-kompatibler Service (Nvidia etc.)
 builder.Services.AddSingleton<OpenAiService>(sp =>
-    new OpenAiService(sp.GetRequiredService<IHttpClientFactory>(), dbService, sp.GetRequiredService<ToolService>()));
+    new OpenAiService(sp.GetRequiredService<IHttpClientFactory>(), dbService, sp.GetRequiredService<ToolService>(), builder.Configuration));
 
 // Telegram Bot (pro Session – Token aus Session-Config)
 var maxIterations = builder.Configuration.GetValue<int>("MaxIterations", 100);

Services/OpenAiService.cs

@@ -22,12 +22,11 @@ public class OpenAiService
     private readonly DatabaseService _db;
     private readonly ToolService _toolService;
 
-    // Provider-Definitionen
-    private static readonly Dictionary<string, (string BaseUrl, string ApiKey)> Providers = new()
-    {
-        ["nvidia"]      = ("https://g4f.space/api/nvidia/v1",      ""),
-        ["pollinations"] = ("https://text.pollinations.ai/openai", "")
-    };
+    // Provider-Keys (statisch für ChatService.ResolveModelId)
+    public static readonly HashSet<string> ProviderKeys = new() { "nvidia", "pollinations", "gemini" };
+
+    // Provider-Definitionen (inkl. API-Keys, instanzgebunden)
+    private readonly Dictionary<string, (string BaseUrl, string ApiKey)> Providers;
 
     // Tools die für OpenAI-kompatible Provider verfügbar sind
     private static readonly List<object> OpenAiTools = new()
@@ -151,12 +150,19 @@ public class OpenAiService
 
     private List<ProviderModel> _nvidiaModels      = new List<ProviderModel>();
     private List<ProviderModel> _pollinationsModels = new List<ProviderModel>();
+    private List<ProviderModel> _geminiModels       = new List<ProviderModel>();
 
-    public OpenAiService(IHttpClientFactory httpFactory, DatabaseService db, ToolService toolService)
+    public OpenAiService(IHttpClientFactory httpFactory, DatabaseService db, ToolService toolService, Microsoft.Extensions.Configuration.IConfiguration configuration)
     {
         _httpFactory = httpFactory;
         _db = db;
         _toolService = toolService;
+        Providers = new Dictionary<string, (string BaseUrl, string ApiKey)>
+        {
+            ["nvidia"]      = ("https://g4f.space/api/nvidia/v1",                                    ""),
+            ["pollinations"] = ("https://text.pollinations.ai/openai",                               ""),
+            ["gemini"]      = ("https://generativelanguage.googleapis.com/v1beta/openai", configuration["GeminiApiKey"] ?? "")
+        };
     }
 
     /// <summary>
@@ -164,15 +170,23 @@ public class OpenAiService
     /// </summary>
     public async Task LoadModelsAsync()
     {
-        _nvidiaModels      = await FetchModels("https://g4f.space/api/nvidia/models",      "Nvidia");
+        _nvidiaModels       = await FetchModels("https://g4f.space/api/nvidia/models", "Nvidia");
         _pollinationsModels = await FetchModels("https://text.pollinations.ai/models", "Pollinations");
+
+        // Gemini: nur kostenlose Free-Tier-Modelle (hardcodiert)
+        _geminiModels = new List<ProviderModel>
+        {
+            new ProviderModel("gemini-2.5-pro",        "Gemini 2.5 Pro"),
+            new ProviderModel("gemini-2.5-flash",      "Gemini 2.5 Flash"),
+            new ProviderModel("gemini-2.5-flash-lite", "Gemini 2.5 Flash Lite"),
+        };
     }
 
-    private async Task<List<ProviderModel>> FetchModels(string url, string providerName)
+    private async Task<List<ProviderModel>> FetchModels(string url, string providerName, string apiKey = "")
     {
         try
         {
-            var client = CreateClient("");
+            var client = CreateClient(apiKey);
             var resp = await client.GetAsync(url);
             if (!resp.IsSuccessStatusCode) return new List<ProviderModel>();
 
@@ -211,8 +225,9 @@ public class OpenAiService
         }
     }
 
-    public List<ProviderModel> GetNvidiaModels()      => _nvidiaModels;
+    public List<ProviderModel> GetNvidiaModels()       => _nvidiaModels;
     public List<ProviderModel> GetPollinationsModels() => _pollinationsModels;
+    public List<ProviderModel> GetGeminiModels()       => _geminiModels;
 
     /// <summary>
     /// Gibt den Provider und das eigentliche Modell-ID aus einem kombinierten Model-String zurück.
@@ -232,7 +247,7 @@ public class OpenAiService
     public static bool IsOpenAiProvider(string model)
     {
         var (provider, _) = ParseModelString(model);
-        return Providers.ContainsKey(provider);
+        return ProviderKeys.Contains(provider);
     }
 
     public async Task StreamChat(

appsettings.json

@@ -14,5 +14,6 @@
   "PayloadLogging": false,
   "PayloadLoggingGzip": false,
   "KreaToken": "",
-  "KreaApiKey": ""
+  "KreaApiKey": "",
+  "GeminiApiKey": ""
 }

wwwroot/index.html

@@ -191,6 +191,9 @@
           <option value="opus-4-5">opus-4-5</option>
           <option value="opus-4-6" selected>opus-4-6</option>
           <option value="haiku-4-5">haiku-4-5</option>
+          <optgroup label="Google Gemini" id="geminiOptgroup">
+            <option value="" disabled>Wird geladen...</option>
+          </optgroup>
           <optgroup label="Pollinations" id="pollinationsOptgroup">
             <option value="" disabled>Wird geladen...</option>
           </optgroup>

wwwroot/js/pages/agent-page.js

@@ -20,6 +20,7 @@ registerPage('agent', {
     const modelEl = document.getElementById('agentModel');
     const nvidiaOptgroup       = document.getElementById('nvidiaOptgroup');
     const pollinationsOptgroup = document.getElementById('pollinationsOptgroup');
+    const geminiOptgroup       = document.getElementById('geminiOptgroup');
 
     // Modelle dynamisch laden
     const loadProviderModels = async (url, prefix, optgroup) => {
@@ -42,7 +43,8 @@ registerPage('agent', {
 
     await Promise.all([
       loadProviderModels('/api/models/nvidia',       'nvidia',       nvidiaOptgroup),
-      loadProviderModels('/api/models/pollinations', 'pollinations', pollinationsOptgroup)
+      loadProviderModels('/api/models/pollinations', 'pollinations', pollinationsOptgroup),
+      loadProviderModels('/api/models/gemini',       'gemini',       geminiOptgroup)
     ]);
     const allowUserChoiceEl = document.getElementById('agentAllowUserChoice');
     const autoCommitEl = document.getElementById('agentAutoCommit');