Add graph capacity API endpoint with tier capacity models

[jfrench9]

Summary

This PR introduces a new API endpoint for retrieving graph capacity information, along with supporting data models for capacity management and tier-based resource allocation.

Key Changes

• New API Endpoint: Added get_graph_capacity endpoint to retrieve capacity information for graphs
• Data Models: Implemented GraphCapacityResponse and TierCapacity models to structure capacity data
• Model Enhancement: Extended GraphInfo model with additional capacity-related fields
• Module Exports: Updated model initialization to expose new capacity models

Key Accomplishments

• Provides comprehensive capacity reporting for graph resources
• Establishes tier-based capacity structure for better resource organization
• Maintains consistent API patterns with existing graph endpoints
• Adds ~390 lines of well-structured code with proper model definitions

Breaking Changes

None. This is a purely additive change that extends existing functionality without modifying current API contracts.

Testing Notes

• Verify the new endpoint returns properly formatted capacity data
• Test model serialization/deserialization for both new models
• Validate tier capacity calculations and reporting accuracy
• Ensure proper error handling for invalid graph capacity requests

Infrastructure Considerations

• New endpoint may require corresponding backend capacity calculation logic
• Consider caching strategies for capacity data if computationally expensive
• Monitor performance impact of capacity queries on large graph datasets
• Ensure proper access controls are in place for capacity information

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Branch Info:

• Source: feature/graph-capacity
• Target: main
• Type: feature

Co-Authored-By: Claude noreply@anthropic.com