feat(api): align provider creation with presets/custom/google sdk

internal/api/handler.go

@@ -46,6 +46,7 @@ func (h *Handler) CreateProvider(c *gin.Context) {
 	}
 
 	providerType := provider.NormalizeType(req.Type)
+	baseURL := strings.TrimSpace(req.BaseURL)
 	googleLocation := provider.DefaultGoogleLocation(providerType, req.GoogleLocation)
 
 	group := strings.TrimSpace(req.Group)
@@ -62,10 +63,37 @@ func (h *Handler) CreateProvider(c *gin.Context) {
 		autoBan = *req.AutoBan
 	}
 
+	// CP-side defaults + validation to prevent DP runtime errors.
+	switch providerType {
+	case provider.TypeOpenAI:
+		if baseURL == "" {
+			baseURL = "https://api.openai.com/v1"
+		}
+	case provider.TypeAnthropic, provider.TypeClaude:
+		if baseURL == "" {
+			baseURL = "https://api.anthropic.com"
+		}
+	case provider.TypeCompatible:
+		if baseURL == "" {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "base_url required for compatible providers"})
+			return
+		}
+	default:
+		// Google SDK providers: base_url is not required.
+		if provider.IsVertexFamily(providerType) && strings.TrimSpace(googleLocation) == "" {
+			googleLocation = provider.DefaultGoogleLocation(providerType, "")
+		}
+		// For Gemini API providers, api_key is required.
+		if provider.IsGoogleFamily(providerType) && !provider.IsVertexFamily(providerType) && strings.TrimSpace(req.APIKey) == "" {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "api_key required for gemini api providers"})
+			return
+		}
+	}
+
 	provider := model.Provider{
 		Name:           req.Name,
 		Type:           strings.TrimSpace(req.Type),
-		BaseURL:        req.BaseURL,
+		BaseURL:        baseURL,
 		APIKey:         req.APIKey,
 		GoogleProject:  strings.TrimSpace(req.GoogleProject),
 		GoogleLocation: googleLocation,
@@ -138,6 +166,10 @@ func (h *Handler) UpdateProvider(c *gin.Context) {
 		nextType = t
 	}
 	nextTypeLower := provider.NormalizeType(nextType)
+	nextBaseURL := strings.TrimSpace(existing.BaseURL)
+	if strings.TrimSpace(req.BaseURL) != "" {
+		nextBaseURL = strings.TrimSpace(req.BaseURL)
+	}
 
 	update := map[string]any{}
 	if strings.TrimSpace(req.Name) != "" {
@@ -186,6 +218,36 @@ func (h *Handler) UpdateProvider(c *gin.Context) {
 		update["ban_until"] = nil
 	}
 
+	// Defaults/validation after considering intended type/base_url.
+	switch nextTypeLower {
+	case provider.TypeOpenAI:
+		if nextBaseURL == "" {
+			update["base_url"] = "https://api.openai.com/v1"
+		}
+	case provider.TypeAnthropic, provider.TypeClaude:
+		if nextBaseURL == "" {
+			update["base_url"] = "https://api.anthropic.com"
+		}
+	case provider.TypeCompatible:
+		if nextBaseURL == "" {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "base_url required for compatible providers"})
+			return
+		}
+	default:
+		if provider.IsGoogleFamily(nextTypeLower) && !provider.IsVertexFamily(nextTypeLower) {
+			// Ensure Gemini API providers have api_key.
+			// If update does not include api_key, keep existing; otherwise require new one not empty.
+			apiKey := existing.APIKey
+			if req.APIKey != "" {
+				apiKey = req.APIKey
+			}
+			if strings.TrimSpace(apiKey) == "" {
+				c.JSON(http.StatusBadRequest, gin.H{"error": "api_key required for gemini api providers"})
+				return
+			}
+		}
+	}
+
 	if len(update) == 0 {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "no fields to update"})
 		return