Add /tokens/metadata endpoint

[Copilot]

Adds a lightweight /tokens/metadata endpoint that returns only token metadata (name, symbol, decimals) — no supply, holder, or transfer counts — for bulk contract/mint lookups. Same query pattern as /tokens.

Endpoints

• GET /v1/evm/tokens/metadata?network=…&contract=… (repeatable contract for bulk)
• GET /v1/svm/tokens/metadata?network=…&mint=… (repeatable mint for bulk)
• GET /v1/tvm/tokens/metadata?network=…&contract=… (repeatable contract for bulk)

Changes

• Routes/SQL: new src/routes/tokens/{evm,svm,tvm}_metadata.{ts,sql}. EVM/TVM read directly from metadata.metadata (no balances/transfers join); SVM joins db_metadata.metadata and db_accounts.decimals_state only.
• Wiring: registered in src/routes/index.ts, with cacheControl() applied to /v1/*/tokens/metadata.
• Capability map: added entries to ROUTE_DEFINITIONS in src/supported-routes.ts (EVM requires balances, SVM requires balances, TVM requires transfers — matching the corresponding /tokens route's network availability).
• Tests: added cases in src/routes/routes.sql.spec.ts asserting 200 + presence of name/symbol/decimals and absence of circulating_supply/holders/total_transfers.

Response shape (EVM example)

{
  "data": [{
    "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7",
    "name": "Tether USD",
    "symbol": "USDT",
    "decimals": 6,
    "network": "mainnet",
    "icon": { "web3icon": "usdt" }
  }]
}

Notes

• No nativeContractRedirect middleware on the metadata route — metadata lookups are valid for the zero-address as well.
• SVM omits program_id (which would require a balances join) to keep the query truly metadata-only.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• networks-registry.thegraph.com
  • Triggering command: /home/REDACTED/.bun/bin/bun bun index.ts (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)