refactor: replace SQL HTTP with gRPC transport in edge marketplace client

Replace raw SQL queries over HTTP (/sql endpoint) with structured gRPC
calls, aligning the edge client with the dojo client's transport layer.

Based on ponderingdemocritus/nft-sql branch optimizations.

Changes:
- client.edge.ts: rewritten to use fetchToriis/fetchCollectionTokens/
  fetchTokenBalances (gRPC) + SDK entity queries instead of
  fetchToriisSql (HTTP POST to /sql)
- getTokenContracts/getTokens for collection metadata
- fetchCollectionTokens for token listing and metadata batch
- fetchTokenBalances for ownership verification
- ToriiQueryBuilder with KeysClause/MemberClause for Order/Book entities
- Updated all tests to mock gRPC transport
- Simplified edge-runtime smoke test

Author: MartianGreed