feat: implement Soroban Cross-Chain Intelligence Hub

[yusuftomilola]

Summary

• Implements a centralized intelligence layer for Stellar cross-chain routing under apps/api/src/intelligence-hub/stellar/
• Aggregates route, provider, and asset intelligence from across the bridging system
• Exposes REST endpoints for querying aggregated insights and full-text search

Changes

• intelligence-hub.types.ts — Type definitions for RouteIntelligence, ProviderIntelligence, AssetIntelligence, IntelligenceSearchResult, and IntelligenceHubSnapshot
• intelligence-hub.service.ts — Service that aggregates route, provider, and asset intelligence with keyword search support
• intelligence-hub.controller.ts — REST controller exposing /intelligence-hub/stellar endpoints (snapshot, routes, providers, assets, search)
• intelligence-hub.module.ts — NestJS module wiring
• app.module.ts — Registers IntelligenceHubModule in the root application module

Endpoints

Method	Path	Description
GET	/intelligence-hub/stellar/snapshot	Full hub snapshot
GET	/intelligence-hub/stellar/routes	Aggregate route intelligence
GET	/intelligence-hub/stellar/providers	Aggregate provider intelligence
GET	/intelligence-hub/stellar/assets	Aggregate asset intelligence
GET	/intelligence-hub/stellar/search?q=	Cross-intelligence search

Test plan

• CI build passes (pnpm run build)
• GET /intelligence-hub/stellar/snapshot returns all aggregated data
• GET /intelligence-hub/stellar/routes returns Stellar route intelligence
• GET /intelligence-hub/stellar/providers returns provider intelligence
• GET /intelligence-hub/stellar/assets returns asset intelligence
• GET /intelligence-hub/stellar/search?q=usdc returns matching results across routes, providers, and assets
• GET /intelligence-hub/stellar/search without q returns 400 Bad Request

closes #543

[mijinummi]

hello @yusuftomilola , please kindly run npm build , update your branch from main to receive latest changes. Thank you for your contribution so far