feat: initialize project backend structure and document system specifications across all modules

docs/specs/onecatalogue/catalogue.md

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+---
+title: "Catalogue"
+type: OpenSpec
+status: Draft
+domain: OneCatalogue
+---
+
+# Catalogue
+
+## Requirement Definition
+A Catalogue groups items for online redemptions (e.g., Cash-back rebates, frequent flyer miles, merchant vouchers). All items included in the Catalogue must be tagged with a specific Catalogue Code. The system supports multiple concurrent catalogues, each with its own Item Master records.
+
+## Process Flow
+
+### Pre-Conditions
+- Users must have access rights to the "Catalogue" screen under the "OneCatalogue" module.
+- Depending on access rights, users can view, add, edit, or approve catalogue records.
+
+## Business Rules
+- Each Catalogue operates within a Start / End date range.
+- Items are only presented to customers if the current date falls within the Catalogue's effective date range.
+
+### Data Schema
+
+#### General Information
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Catalogue Code | User-specified code identifying the catalogue. Used by front-end systems. | String (10) | Required. |
+| Description | A description of this catalogue. | String (50) | Required. Default description if no specific language is chosen. |
+| Effective From Date | Date from which the catalogue is effective. | Date | Required. |
+| Effective To Date | Date until which the catalogue is effective. | Date | Required. |
+| Icon | Icon of the catalogue. | Image | Optional. |
+
+#### Content Configuration
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Language | Selected language for specific description setup. | String (Lookup) | Required. |
+| Description | Description of the catalogue in the chosen language. | String (100) | Required. |
+
+## Post-Conditions
+- The Catalogue information is returned to the front-end during Item Enquiry responses for searching.
+
+## Exception Flow
+- None specified.