feat(advertising): implement advertising service with CRUD operations and validation

- Added advertising.go for managing advertising entries with Create and List functionalities.
- Implemented CreateAdvertisingParams with validation for name, email, and status.
- Created migrations for advertising table structure.
- Added tests for advertising parameters validation.

feat(promo): introduce promo management with validation and CRUD operations

- Added promo.go for managing promotional entries with Create, Update, and List functionalities.
- Implemented CreatePromoParams and UpdatePromoParams with validation for position, section, and weeks.
- Created migrations for promo table structure.
- Added tests for promo parameters validation.

feat(images): add image management service with upload and retrieval

- Added images.go for managing image uploads and retrieval from storage.
- Implemented SaveImageParams with validation for image description and data.
- Created migrations for images table structure.
- Added tests for image parameters validation and data parsing.

images/migrations/1_create_images.up.sql

@@ -0,0 +1,5 @@
+CREATE TABLE images (
+    uuid UUID PRIMARY KEY,
+    description TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);