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

docs/specs/reward_campaign/campaign_insight.md

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+---
+title: "Campaign Insight"
+type: OpenSpec
+status: Draft
+domain: Reward Campaign Management
+---
+
+# Campaign Insight
+
+## Requirement Definition
+Combines data from across multiple data sources into charts to track and display customer and campaign activities, providing a high-level performance overview.
+
+## Process Flow
+
+### Pre-Conditions
+- Users must have access rights to the Campaign Insight module.
+
+## Business Rules
+
+### Data Schema
+
+#### Key Metrics Displayed
+- Total Redeemed Points.
+- Total Members (Active vs Inactive).
+- Total Partners.
+- Total Active Reward Campaigns.
+
+#### Charts & Visualizations
+- **Campaign Performance**: Displays the Top N Campaigns by awarded points, comparing "Target Avg Transaction Value" vs actual awards.
+- **Top Channels**: Breakdown of transactions by entry channel (e.g., EDC, Web, Call Center).
+- **Points Awarded vs Redeemed**: Time-series comparison of point inflows vs outflows over a period.
+
+### Execution
+- **View-only dashboard.**
+- Real-time or near-real-time aggregation depending on batch job configuration for analytics.
+
+## Exception Flow
+- N/A