Add fake llm provider

Change-Id: I7983796013f27e146506a42c8238b69a1838f1d9
diff --git a/server/test_fake_llm.go b/server/test_fake_llm.go
new file mode 100644
index 0000000..a322599
--- /dev/null
+++ b/server/test_fake_llm.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"github.com/iomodo/staff/llm"
+	_ "github.com/iomodo/staff/llm/providers" // Auto-register providers
+)
+
+func main() {
+	// Create fake LLM config
+	config := llm.Config{
+		Provider: llm.ProviderFake,
+		APIKey:   "fake-key",
+		BaseURL:  "fake://test",
+	}
+
+	// Create provider
+	provider, err := llm.CreateProvider(config)
+	if err != nil {
+		log.Fatalf("Failed to create provider: %v", err)
+	}
+	defer provider.Close()
+
+	// Test chat completion
+	req := llm.ChatCompletionRequest{
+		Model: "fake-gpt-4",
+		Messages: []llm.Message{
+			{
+				Role:    llm.RoleSystem,
+				Content: "You are a helpful AI assistant.",
+			},
+			{
+				Role:    llm.RoleUser,
+				Content: "Create a solution for implementing user authentication",
+			},
+		},
+		MaxTokens:   &[]int{4000}[0],
+		Temperature: &[]float64{0.3}[0],
+	}
+
+	fmt.Println("Testing Fake LLM Provider...")
+	fmt.Println("==========================")
+
+	resp, err := provider.ChatCompletion(context.Background(), req)
+	if err != nil {
+		log.Fatalf("Chat completion failed: %v", err)
+	}
+
+	fmt.Printf("Response ID: %s\n", resp.ID)
+	fmt.Printf("Model: %s\n", resp.Model)
+	fmt.Printf("Provider: %s\n", resp.Provider)
+	fmt.Printf("Usage: %+v\n", resp.Usage)
+	fmt.Println("\nGenerated Solution:")
+	fmt.Println("===================")
+	fmt.Println(resp.Choices[0].Message.Content)
+	fmt.Println("\n✅ Fake LLM Provider is working correctly!")
+}
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