Go: add stream / think chat (#14242)

### What problem does this PR solve?

1. Supports stream and non-stream chat
2. Supports think and non-think chat
3. List supported models from DeepSeek service. (This command can be
used to verify the API validity)

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/cli/common_command.go

@@ -335,6 +335,45 @@ func (c *RAGFlowClient) ListModels(cmd *Command) (ResponseIf, error) {
 	return &result, nil
 }
 
+func (c *RAGFlowClient) ListSupportedModels(cmd *Command) (ResponseIf, error) {
+
+	providerName, ok := cmd.Params["provider_name"].(string)
+	if !ok {
+		return nil, fmt.Errorf("provider_name not provided")
+	}
+	instanceName, ok := cmd.Params["instance_name"].(string)
+	if !ok {
+		return nil, fmt.Errorf("instance_name not provided")
+	}
+
+	var endPoint string
+	if c.ServerType == "admin" {
+		endPoint = fmt.Sprintf("/admin/providers/%s/instances/%s/models?supported=true", providerName, instanceName)
+	} else {
+		endPoint = fmt.Sprintf("/providers/%s/instances/%s/models?supported=true", providerName, instanceName)
+	}
+
+	resp, err := c.HTTPClient.Request("GET", endPoint, true, "web", nil, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list models: %w", err)
+	}
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("failed to list models: HTTP %d, body: %s", resp.StatusCode, string(resp.Body))
+	}
+
+	var result CommonResponse
+	if err = json.Unmarshal(resp.Body, &result); err != nil {
+		return nil, fmt.Errorf("failed to list models: invalid JSON (%w)", err)
+	}
+
+	if result.Code != 0 {
+		return nil, fmt.Errorf("%s", result.Message)
+	}
+	result.Duration = resp.Duration
+	return &result, nil
+}
+
 func (c *RAGFlowClient) ShowModel(cmd *Command) (ResponseIf, error) {
 	providerName, ok := cmd.Params["provider_name"].(string)
 	if !ok {