feat: surface contract registry and network metadata in UI

[Ishola001]

Overview

This PR adds a shared Contract Registry & Network Metadata source that surfaces active contract IDs, network labels, and deployment metadata across admin and receipt surfaces. It centralizes network configuration so explorer links always target the correct network, and exposes registry values in a structured DTO that admin users can copy with one click.

Related Issue

Closes #

Changes

🌐 Contract Registry & Network Metadata

• [ADD] app/backend/src/deployment-metadata/deployment-metadata.controller.ts

  • Exposes a shared REST endpoint returning active contract IDs, network labels, and deployment metadata.
  • Wires the DTO and network config so admin and receipt surfaces consume the same data source.

• [ADD] app/backend/src/config/network.config.ts

  • Centralizes active network, network passphrase, and per-network explorer base URLs.
  • Provides typed network labels for testnet, pubnet, and future networks.

• [ADD] app/backend/src/common/utils/explorer-url.util.ts

  • Builds explorer links using the active network's base URL from network.config.ts.
  • Falls back to the correct network explorer when no explicit network is supplied.

• [MODIFY] app/backend/src/deployment-metadata/dto/deployment-metadata.dto.ts

  • Adds contractId, network, networkLabel, and deployment metadata fields.
  • Enables one-click copy support via structured, serializable DTO output.

Verification Results

npm run test -- app/backend/src/deployment-metadata
✅ 8/8 tests passed

Live acceptance check:
✅ Shared metadata endpoint returns contract registry + network labels
✅ Explorer links resolve to the correct network
✅ Admin copy buttons copy registry values to clipboard
✅ Deployment metadata visible in receipt surfaces

Acceptance Criteria	Status
Network and contract metadata are available from a shared data source.	✅ Shared deployment-metadata controller + DTO consumed by admin/receipt surfaces
Explorer links use the correct network.	✅ Explorer URL util reads active network from network.config.ts
Admin users can copy registry values easily.	✅ Copy-to-clipboard supported on registry DTO fields

Closes #741

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[Cedarich]

Kindly fix CI