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

docs/specs/onemarketing/blacklist.md

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+---
+title: "Blacklist"
+type: OpenSpec
+status: Draft
+domain: OneMarketing
+---
+
+# Blacklist
+
+## Requirement Definition
+A list of customers excluded from marketing campaigns for strategic reasons (e.g., fraud).
+
+## Process Flow
+
+### Pre-Conditions
+- Users must have access rights in the "Black List" module.
+
+## Business Rules
+
+### Data Schema
+
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| ID | Blacklist identifier. | String (10) | Required. |
+| Name List | Name of the blacklist. | String (50) | Required. |
+| Description | Description. | String (200) | Optional. |
+| Input Type | Input from screen or Upload file. | Enum | Required. |
+| Customer List | List of selected CIF numbers. | Array of Strings (Lookup) | Required if Input Type is "Input from screen". Requires >= 4 digits to search. |
+| Upload File | Uploaded CSV/XLS file. | File | Required if Input Type is "Upload file". Max 50MB. |
+
+### Execution
+- Users can review or download the customer list.
+- Blacklisted customers are strictly blocked from receiving notifications from OMR.
+
+## Exception Flow
+- Validation errors for file type/size during upload display an error message.