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

docs/specs/onemarketing/ab_testing.md

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+---
+title: "A/Bn Testing"
+type: OpenSpec
+status: Draft
+domain: OneMarketing
+---
+
+# A/Bn Testing
+
+## Requirement Definition
+Evaluates and optimizes marketing elements (content or target customers) to identify better performing campaigns. Supports A/Bn Content testing (same target, different messages) and A/Bn Target Customer testing (same message, different targets).
+
+## Process Flow
+
+### Pre-Conditions
+- Third-party data/results must be available for OLS to collect and analyze.
+- Users must have access rights in the "A/Bn Testing" module.
+
+## Business Rules
+
+### Data Schema (A/Bn Message Content Testing)
+
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Campaign ID | Unique identifier. | String (20) | Required. No special characters. |
+| Campaign Description | Description. | String (100) | Optional. |
+| Effective Date From | Start date. | Date | Optional. |
+| Effective End date | End date. | Date | Required. |
+| Message Channel | SMS, Email, Push. | Enum | Required. |
+| Target Customer | OMR Criteria setup for targeting. | Rule | Required. |
+| Variant Content | Multiple variants (A, B, N) defining content based on channel. | Array of Messages | Required. Must be unique within the campaign. |
+| Run Schedule | Schedule parameters. | Complex | Required. |
+
+### Data Schema (A/Bn Target Customer Testing)
+
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Campaign ID | Unique identifier. | String (20) | Required. No special characters. |
+| Campaign Description | Description. | String (100) | Optional. |
+| Effective Date From | Start date. | Date | Optional. |
+| Effective End date | End date. | Date | Required. |
+| Variant Target Customer | Multiple variants (A, B, N) defining OMR Criteria. | Array of Rules | Required. Must be unique within the campaign. |
+| Run Schedule | Schedule parameters. | Complex | Required. |
+
+### Execution
+- ABn batch job triggers effective testing requests based on schedule.
+- For content testing, sends variant messages to the same subset of targets. Tracks open rates, click-through rates.
+- For target testing, evaluates which criteria setup reaches the most/best customers.
+
+## Post-Conditions
+- Results are reported back to the user to make data-driven decisions on campaign rollout.