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

docs/specs/00_MIGRATION_REPORT.md

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+# Migration Report
+
+## Summary
+The migration of the monolithic FSD (Functional Specification Document) Markdown files to the OpenSpec standard is complete. The goal was to decompose massive, human-oriented Word-converted markdown files into Agent-Friendly, atomic, and structured OpenSpec documents. 
+
+## Completed Tasks
+1. **Decomposition:** All major monolithic files have been decomposed into domain-specific subdirectories.
+2. **Archiving:** The original monolithic markdown files have been moved to `docs/specs/archive/`.
+3. **Format Standardization:** The newly created documents follow the OpenSpec format, including proper YAML frontmatter (`title`, `type`, `status`, `domain`).
+4. **Cleanup:** Unnecessary UI clutter, malformed artifacts (e.g. `[Image Removed]`), and verbose narrative instructions were removed or converted into structured business rules and data schemas.
+
+## Output Structure
+The new documentation is organized into the following domains under `docs/specs/`:
+* `customer_management/`: Profiles, Accounts, Cards, Pool Balances, Transactions, Adjustments, etc.
+* `reward_campaign/`: Campaign Structures, Rules, Criteria, Formulas, Counter Definitions, Transaction Categories, etc.
+* `onetargeting/`: Segmentation, Audiences.
+* `onecatalogue/`: Catalogues, Categories, Master Items, Vouchers.
+* `onemarketing/`: Messages, Campaigns, A/B Testing, Whitelists, Blacklists.
+* `oneaccess/`: Users, Permissions, Profiles.
+* `oneadmin/`: Framework behavior.
+* `system_management/`: Application parameters.
+* `introduction/`: Terminology.
+* `reference/`: References, Change History.
+
+## Next Steps
+- Implement Agent tooling capable of reading these OpenSpec files to generate test cases or boilerplate code.
+- Ensure any future updates to the requirements are made directly to the atomic OpenSpec files, not the archived monolithic documents.