**feat(logging, middleware): add error-based logging support and error log management**

- Introduced `logOnErrorOnly` mode to enable logging only for error responses when request logging is disabled.
- Added endpoints to list and download error logs (`/request-error-logs`).
- Implemented error log file cleanup to retain only the newest 10 logs.
- Refactored `ResponseWriterWrapper` to support forced logging for error responses.
- Enhanced middleware to capture data for upstream error persistence.
- Improved log file naming and error log filename generation.

internal/api/middleware/request_logging.go

@@ -15,8 +15,8 @@ import (
 
 // RequestLoggingMiddleware creates a Gin middleware that logs HTTP requests and responses.
 // It captures detailed information about the request and response, including headers and body,
-// and uses the provided RequestLogger to record this data. If logging is disabled in the
-// logger, the middleware has minimal overhead.
+// and uses the provided RequestLogger to record this data. When logging is disabled in the
+// logger, it still captures data so that upstream errors can be persisted.
 func RequestLoggingMiddleware(logger logging.RequestLogger) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		if logger == nil {
@@ -30,12 +30,6 @@ func RequestLoggingMiddleware(logger logging.RequestLogger) gin.HandlerFunc {
 			return
 		}
 
-		// Early return if logging is disabled (zero overhead)
-		if !logger.IsEnabled() {
-			c.Next()
-			return
-		}
-
 		// Capture request information
 		requestInfo, err := captureRequestInfo(c)
 		if err != nil {
@@ -47,6 +41,9 @@ func RequestLoggingMiddleware(logger logging.RequestLogger) gin.HandlerFunc {
 
 		// Create response writer wrapper
 		wrapper := NewResponseWriterWrapper(c.Writer, logger, requestInfo)
+		if !logger.IsEnabled() {
+			wrapper.logOnErrorOnly = true
+		}
 		c.Writer = wrapper
 
 		// Process the request