feat: enhance request logging and account handling in CLI proxy

- Added helper functions to log API request and response payloads in the Gin context.
- Improved `AccountInfo` to support cookie-based authentication in addition to API key and OAuth.
- Updated log messages for better clarity on account types used.

internal/runtime/executor/logging_helpers.go

@@ -0,0 +1,41 @@
+package executor
+
+import (
+	"bytes"
+	"context"
+
+	"github.com/gin-gonic/gin"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
+)
+
+// recordAPIRequest stores the upstream request payload in Gin context for request logging.
+func recordAPIRequest(ctx context.Context, cfg *config.Config, payload []byte) {
+	if cfg == nil || !cfg.RequestLog || len(payload) == 0 {
+		return
+	}
+	if ginCtx, ok := ctx.Value("gin").(*gin.Context); ok && ginCtx != nil {
+		ginCtx.Set("API_REQUEST", bytes.Clone(payload))
+	}
+}
+
+// appendAPIResponseChunk appends an upstream response chunk to Gin context for request logging.
+func appendAPIResponseChunk(ctx context.Context, cfg *config.Config, chunk []byte) {
+	if cfg == nil || !cfg.RequestLog {
+		return
+	}
+	data := bytes.TrimSpace(bytes.Clone(chunk))
+	if len(data) == 0 {
+		return
+	}
+	if ginCtx, ok := ctx.Value("gin").(*gin.Context); ok && ginCtx != nil {
+		if existing, exists := ginCtx.Get("API_RESPONSE"); exists {
+			if prev, okBytes := existing.([]byte); okBytes {
+				prev = append(prev, data...)
+				prev = append(prev, []byte("\n\n")...)
+				ginCtx.Set("API_RESPONSE", prev)
+				return
+			}
+		}
+		ginCtx.Set("API_RESPONSE", data)
+	}
+}