fix(model): still use string in system prompt

chat/chat.go

@@ -63,7 +63,7 @@ func (l *Log[T]) Add(grp int64, item T, isbot bool) {
 func (l *Log[T]) Modelize(p model.Protocol, grp int64, sysp string, isusersystem bool) deepinfra.Model {
 	m := p
 	if sysp != "" && !isusersystem {
-		m.System(model.NewContentText(sysp))
+		m.System(sysp)
 	}
 	l.mu.RLock()
 	defer l.mu.RUnlock()

model/api.go

@@ -22,7 +22,7 @@ type Requester interface {
 }
 
 type MessageBuilder[T any] interface {
-	System(prompt ...Content) T
+	System(prompt string) T
 	User(prompt ...Content) T
 	Assistant(prompt ...Content) T
 }

model/genai.go

@@ -166,9 +166,9 @@ func (cs Contents) ToGenAIParts() []GenAIPart {
 	return ps
 }
 
-func (opai *GenAI) System(prompt ...Content) Protocol {
+func (opai *GenAI) System(prompt string) Protocol {
 	opai.SystemInstruction = &GenAIContent{
-		Parts: Contents(prompt).ToGenAIParts(),
+		Parts: []GenAIPart{{Text: prompt}},
 	}
 	return opai
 }

model/ollama.go

@@ -77,11 +77,11 @@ func (ollm *OLLaMA) OutputRaw() Contents {
 	return Contents{NewContentText(ollm.Message.Content)}
 }
 
-func (ollm *OLLaMA) System(prompt ...Content) Protocol {
+func (ollm *OLLaMA) System(prompt string) Protocol {
 	ollm.Messages = make([]OLLaMAMessage, 1, 8)
 	ollm.Messages[0] = OLLaMAMessage{
 		Role:    "system",
-		Content: prompt[0].Text,
+		Content: prompt,
 	}
 	return ollm
 }

model/openai.go

@@ -115,7 +115,7 @@ func (opai *OpenAI) OutputRaw() Contents {
 	return nil
 }
 
-func (opai *OpenAI) System(prompt ...Content) Protocol {
+func (opai *OpenAI) System(prompt string) Protocol {
 	opai.Messages = make([]OpenAIMessage, 1, 8)
 	raw, err := json.Marshal(&prompt)
 	if err != nil {