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

docs/specs/oneaccess/user_group.md

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+---
+title: "User Group"
+type: OpenSpec
+status: Draft
+domain: OneAccess
+---
+
+# User Group
+
+## Requirement Definition
+The User Group module is utilized to categorize users who share identical permissions within OLS. It defines the group to be assigned to a particular user or group of users.
+
+## Process Flow
+
+### Trigger
+- A new user group needs to be defined.
+- An existing user group needs to be modified, or a user needs to review the existing group.
+
+### Pre-Conditions
+- Users must have access rights to the User Group module to view, add, or edit user group records.
+
+## Business Rules
+- The user group ID must be a unique value.
+
+### Data Schema
+
+#### General Information
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| User Group ID | The identity of the user group. | String (10) | Required. Must be unique. |
+| User Group Name | The name of the user group. | String (100) | Required. |
+| Description | Description for the user group. | String (200) | Optional. |
+
+#### Group Users (View Only)
+*Lists all active User Profile records assigned to this group.*
+
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| User ID | The identity of the user belonging to the chosen group. | String | Read-only |
+| User Name | The name of the user. | String | Read-only |
+| Email | Email address of the user. | String | Read-only |
+
+## Post-Conditions
+- The data is updated in the database and related screens.
+
+## Exception Flow
+- If input data fails validation, the action is canceled, and the operation fails.