reimplement agent,provider and add file history

internal/llm/prompt/prompt.go

@@ -0,0 +1,19 @@
+package prompt
+
+import (
+	"github.com/kujtimiihoxha/termai/internal/config"
+	"github.com/kujtimiihoxha/termai/internal/llm/models"
+)
+
+func GetAgentPrompt(agentName config.AgentName, provider models.ModelProvider) string {
+	switch agentName {
+	case config.AgentCoder:
+		return CoderPrompt(provider)
+	case config.AgentTitle:
+		return TitlePrompt(provider)
+	case config.AgentTask:
+		return TaskPrompt(provider)
+	default:
+		return "You are a helpful assistant"
+	}
+}