Add context.Context parameter to all API methods

Enable request timeout and cancellation control by adding context.Context
as the first parameter to all SDK API methods. This allows users to:
- Set per-request timeouts
- Cancel in-flight requests
- Pass request-scoped values

system/system.go

@@ -1,6 +1,8 @@
 package system
 
 import (
+	"context"
+
 	"git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go/client"
 	"git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go/models"
 )
@@ -13,13 +15,13 @@ func NewSystemClient(c *client.Client) *SystemClient {
 	return &SystemClient{client: c}
 }
 
-func (sc *SystemClient) Health() error {
-	return sc.client.Get("/api/v1/health", nil)
+func (sc *SystemClient) Health(ctx context.Context) error {
+	return sc.client.Get(ctx, "/api/v1/health", nil)
 }
 
-func (sc *SystemClient) Status() (*models.SystemStatus, error) {
+func (sc *SystemClient) Status(ctx context.Context) (*models.SystemStatus, error) {
 	var resp models.SystemStatus
-	err := sc.client.Get("/api/v1/status", &resp)
+	err := sc.client.Get(ctx, "/api/v1/status", &resp)
 	if err != nil {
 		return nil, err
 	}