Feature: Add Oracle metrics endpoint for monitoring

[Smartdevs17]

Problem

No metrics endpoint exists for monitoring Oracle health. Operators can't track update frequency, error rates, or provider status.

Context

Production monitoring requires metrics for alerting on degraded service quality.

Proposed Solution

Add a lightweight HTTP metrics endpoint:

GET /metrics
{
  "uptime": 3600,
  "lastUpdate": "2024-01-01T00:00:00Z",
  "updateCount": 360,
  "errorCount": 2,
  "providers": { "binance": "healthy", "coingecko": "degraded" },
  "assets": { "XLM": { "price": 0.12, "age": 10 } }
}

Acceptance Criteria

• Metrics endpoint returns service status
• Provider health tracked
• Update frequency and error rates available
• Asset price ages tracked
• Tests verify metrics accuracy

Technical Notes

• File: New HTTP server in oracle/src/index.ts or separate file

Constraints

• Must not interfere with main update loop

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