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

docs/specs/reward_campaign/rep_rule.md

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+---
+title: "Redemption Extract & Process (REP) Rule"
+type: OpenSpec
+status: Draft
+domain: Reward Campaign Management
+---
+
+# Redemption Extract & Process (REP) Rule
+
+## Requirement Definition
+Extracts reward pool balances to automatically output them as Cash Rebates or Partner Points to an external destination system (like a Core Banking system or Airline Partner).
+
+## Process Flow
+
+### Pre-Conditions
+- Users must have access rights.
+
+## Business Rules
+
+### Data Schema
+
+#### Extraction Settings
+| Field Name | Description | Logic Type | Constraints / Rules |
+|---|---|---|---|
+| Rule Type | REP. | Enum | Required. |
+| Pool to Extract | Pool containing the balance. | Enum (Lookup) | Required. |
+| Minimum Pool Balance | Threshold before extraction. | Decimal | Optional. |
+| Trigger Campaign rule | Validates criteria before extraction. | Boolean | Default False. |
+| Redeem TC | TC used to post the redemption. | Enum (Lookup) | Required. |
+| Output Redemption As | Format/System of output (e.g. Cash Rebate file).| Enum (Lookup) | Required. |
+| Run schedule | Day, Month, Annual, Stmt Cycle, N days AOD. | Enum (Lookup) | Required. Defines execution frequency. |
+
+### Execution
+- Evaluated by the REP Batch scheduled at end-of-day.
+- The full eligible amount of the Pool balance is deducted and output to a file (e.g., `OLSCRTXN`).
+- If `Trigger Campaign rule` is true, an intermediate Redeem rule evaluates criteria, and the extracted amount is the minimum of (Available Balance, Formula Result).
+
+## Exception Flow
+- N/A