Add configuration file and update server settings

- Introduced a new `config.yaml` file for managing server, database, cache, queue, AI, scraping, logging, and rate limiting configurations.
- Updated `docker-compose.yml` to reflect the new server port (8081) and adjusted health check endpoints accordingly.
- Modified `Dockerfile` to expose the new server port.
- Updated `README.md` to reflect changes in server configuration and added documentation for the new configuration structure.
- Added test scripts for server and Swagger documentation testing.
- Refactored customer domain structure to align with new configuration settings and improve maintainability.

internal/customer/validation.go

@@ -0,0 +1,32 @@
+package customer
+
+import (
+	"time"
+
+	"github.com/asaskevich/govalidator"
+)
+
+// init registers custom validators
+func init() {
+	// Register custom validators
+	govalidator.CustomTypeTagMap.Set("unix_timestamp", govalidator.CustomTypeValidator(func(i interface{}, context interface{}) bool {
+		switch v := i.(type) {
+		case int64:
+			// Check if timestamp is reasonable (not too old, not in the future)
+			now := time.Now().Unix()
+			minTimestamp := now - (100 * 365 * 24 * 60 * 60) // 100 years ago
+			maxTimestamp := now + (10 * 365 * 24 * 60 * 60)  // 10 years in future
+			return v >= minTimestamp && v <= maxTimestamp
+		case *int64:
+			if v == nil {
+				return true // nil is valid for optional fields
+			}
+			now := time.Now().Unix()
+			minTimestamp := now - (100 * 365 * 24 * 60 * 60) // 100 years ago
+			maxTimestamp := now + (10 * 365 * 24 * 60 * 60)  // 10 years in future
+			return *v >= minTimestamp && *v <= maxTimestamp
+		default:
+			return false
+		}
+	}))
+}