Add observability module: Spring AI built-in meters and spans, cost per endpoint from token usage, Prometheus and Grafana dashboard

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01JXVi2GMQ7bR5EmbUFdDj7N
2026-10-09 06:39:21 +00:00
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+# One failed user request (the provider returns HTTP 500)
+
+HTTP requests the provider received for that one call: 4
+model-call timers recorded:
+  error=InternalServerException  response.model=none                     count=1
+chat-client timers with an error: 1
+app.ai.unpriced{endpoint=ask,reason=no-usage}: 1
+app.ai.cost.usd recorded for the failed call: 0