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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+# Tokens and cost per endpoint (illustrative price: 0.15 USD in / 0.60 USD out per million tokens)
+
+endpoint      input   output       cost USD
+ask               1        4     0.00000255
+summarize       511       13     0.00008445
+weather          19       18     0.00001365
+
+framework model-level tokens: input=531 output=35
+our per-endpoint tokens     : input=531 output=35
+total cost USD: 0.00010065