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

docs/specs/customer_management/attribute.md

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+---
+title: "Attribute"
+type: OpenSpec
+status: Draft
+domain: Customer Management
+---
+
+# Attribute
+
+## Requirement Definition
+Provides a consolidated view of all attributes assigned to a customer, account, or card, populated by batch processes or Campaign Rules.
+
+## Process Flow
+
+### Pre-Conditions
+- Users must have access rights in the "Attribute" module.
+
+## Business Rules
+
+### Data Schema
+
+#### Attribute Value Detail
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Attribute Group | Group of attribute. | String | Read-only. |
+| Attribute ID | Attribute ID. | String | Read-only. |
+| Attribute Name | Attribute Name. | String | Read-only. |
+| Entity | Client, Product_Account, or Card. | Enum | Read-only. |
+| Entity ID | CIF Number, PA Number, or Card Number based on Entity. | String | Read-only. |
+| Account Type | Required for Account attribute. | String | Read-only. |
+| Attribute Value | Value of the attribute. | String/Number | Read-only. |
+| Effective Date From | Start date. | Date | Read-only. |
+| Effective Date To | End date. | Date | Read-only. |
+
+#### Linked Campaign Details
+Lists Campaign Rules referencing this attribute.
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Campaign ID | Campaign ID. | String | Read-only. |
+| Campaign Name | Name of Campaign. | String | Read-only. |
+| Campaign Rule | Campaign Rules ID. | String | Read-only. |
+| Campaign Rule Name | Name of Campaign Rule. | String | Read-only. |
+| Effect Date | Effective from and to dates. | Date | Read-only. |
+
+### Execution
+- **View-only screen.**
+- Data from `ATTRIBUTE_VALUE` table.
+- Filterable by Entity level and effective dates. Only effective records listed by default.
+
+## Exception Flow
+- N/A