Missing Error Response Schema

[fenar]

Severity: Medium
Affected Services: All

Problem:
No standard error response format defined across services.

Resolution:
Define standard error schema:

{
  "error": {
    "code": "INVALID_BID_AMOUNT",
    "message": "Bid amount exceeds work budget",
    "details": {
      "bid_amount": 1.50,
      "max_budget": 1.00
    },
    "request_id": "req_abc123",
    "timestamp": "2025-01-15T10:30:00Z"
  }
}