Portfolio history - connector filter is accepted but ignored in returned snapshots

[rapcmia]

Describe the bug

This issue was noticed while checking the portfolio API routes during #178 tests. The expected behavior was that /portfolio/history would return only the connector requested in connector_names, just like /portfolio/state and /portfolio/distribution already do. Instead, the history route accepted the filter, echoed it back in the pagination metadata, but still returned balances from other connectors in the same account snapshot.

curl -s -u XXX:XXX -X POST http://localhost:8000/portfolio/history \
  -H "Content-Type: application/json" \
  -d '
{
  "account_names": ["master_account"],
  "connector_names": ["gate_io"],
  "limit": 1,
  "interval": "5m"
}' | jq

{
  "data": [
    {
      "state": {
        "master_account": {
          "gate_io": ["GT", "BTC", "SOL", "NOT", "HYPE", "GRAM", "XRP", "ETH", "USDT", "POLIS", "TLOS"],
          "hyperliquid": ["USDC", "LQNA", "HYPE"],
          "hyperliquid_perpetual": ["USD"]
        }
      }
    }
  ],
  "pagination": {
    "filters": {
      "connector_names": ["gate_io"]
    }
  }
}

It also appears to exist in the main branch when compared. In routers/portfolio.py, the history route tries to filter a nested connectors field, but the actual returned history structure stores connector names directly under each account inside state. That mismatch likely causes the connector filter to be ignored for the returned history data.

Steps to reproduce bug

Assuming you have added multiple connectors including gate_io

1. Call POST /portfolio/history with a real account name and a single connector in connector_names, such as ["gate_io"].
2. Check the returned data[] object for that account.
3. Confirm that the response still includes other connectors even though the pagination filters echo back only the requested connector.

[rapcmia]

Test update:

• build local whl and integrate to HAPI + condor, ok
• build local docker gateway and HAPI, ok
• Successfully started (condor source, HAPI and gateway on docker)
• Build strategy using agent builder (5/5)
• Strategy trading on Orca SOLUSDC to monitor PNL fix (in progress)