feat: integrate frontend plans with live API

[JoyLight00]

Summary

Replaces direct localStorage mock-store usage in the frontend plan and KYC workflows with live backend API integration.

Changes

• Added centralized mock/live data selection through NEXT_PUBLIC_USE_MOCK_DATA.
• Live API mode is now the default.
• Replaced direct mock-store reads in:
  • Asset-owner overview
  • Plans list
  • Plan detail
  • Plan editing
  • Plan creation
  • Claim search
  • KYC status handling
• Added loading cancellation and user-facing API error states.
• Added optional automatic revalidation support to useApiQuery.
• Normalized raw Axum API responses for plan list and detail endpoints.
• Added wallet-address support to GET /api/kyc/status.
• Updated KYC submission payloads to match the backend’s snake_case DTO.
• Added the missing backend GET /api/plans/{id} route.
• Preserved local demo behavior when NEXT_PUBLIC_USE_MOCK_DATA=true.

Configuration

NEXT_PUBLIC_USE_MOCK_DATA=false
NEXT_PUBLIC_API_URL=http://localhost:8080

Set NEXT_PUBLIC_USE_MOCK_DATA=true to use the local demo store.

Validation

• git diff --check passed.
• Frontend tests and TypeScript validation were not runnable because frontend dependencies are not installed and the repository lockfile is missing the workspace entry.
• Backend compilation was not runnable because cargo is unavailable in the container.

Closes #1032

[ONEONUORA]

@JoyLight00
Pls make your implementation to pass CI checks

[JoyLight00]

@JoyLight00 Pls make your implementation to pass CI checks

Done Boss

[ONEONUORA]

Great job @JoyLight00