[Architectural & Product Expansion] Sponsorship "Quotas"

[0xVida]

Description:
Monthly caps on fees per user (not just per tenant).

Requirements and Context:

CRITICAL CONTEXT: All code changes and execution steps for this issue must happen strictly within the server folder of the repository. Ensure you are working inside the server/ directory before beginning.

The Fluid platform requires professional-grade architectural & product expansion standards. This issue focuses on sponsorship "quotas" to ensure the system is production-ready and resilient.

Acceptance Criteria:

• Implement sponsorship "quotas" logic in the server package
• Ensure full test coverage (unit and integration)
• Verify compliance with internal design and security standards
• Validate Sponsorship "Quotas" handles edge cases correctly

Deliverables:

• Code implementation in server/src
• Updated documentation in /docs
• Verification report with terminal output/screenshots

NOTE: This issue will NOT be reviewed or approved without functional screenshots or verified terminal output where applicable!

Suggested Execution:

1. Research existing implementation in server
2. Draft a technical design for Sponsorship "Quotas"
3. Execute implementation and verify against local environment
4. Run full test suite to ensure no regressions

Guidelines:

• Maintain consistency with the existing TypeScript/Rust coding standards
• Prioritize performance and memory efficiency

Example Commit Message:

feat: sponsorship-quotas