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#### Description
- Adds `GET|POST /prometheus/api/v1/query_range` and
`/prometheus/api/v1/query` (`pkg/prometheus/promapi`), following the
Prometheus HTTP API contract: float-unix or RFC3339 times, float-seconds
or duration-string durations, the `{status, data, errorType, error,
warnings, infos}` envelope with Prometheus' status codes, and the
11,000-point cap.
- The `/prometheus` prefix works as a drop-in Prometheus base URL:
Grafana's Prometheus data source, promtool, and the PromQL compliance
tester append `/api/v1/*` to a base URL, so they can point at SigNoz
unmodified. Same layout as Mimir/Cortex.
- Wired through `signoz.Handlers` (`prometheus.Handler` interface,
constructed in `NewHandlers`) like the other domain handlers.
- Range queries serve through the `RangeExecutor` capability when the
provider has it, so a clickhousev2-serving deployment transpiles through
these endpoints too.
- New `promapiconformance` integration suite: the frozen promqltest
corpus replayed against these endpoints with `prometheus::provider:
clickhousev2` — the two paths nothing else exercises (v2 as serving
provider, and this API surface). Instant cases go through `/query` with
a real `time` parameter. The `instant-coarse` corpus variants are
skipped — they exist only to encode instant evals as coarse ranges for
the v5 API, and their transpiled coarse-step serving is already covered
and ledgered by promqlconformance's clickhousev2 leg — so this suite
asserts zero divergences with no ledger of its own.
- Purely additive: the existing `GET /api/v1/query_range` and `GET
/api/v1/query` handlers are untouched. `openapi.yml` is generated and
these mux-registered routes are outside the generator, so their
documentation is the upstream Prometheus API contract they follow.
#### Additional Information
Final slice of the clickhouseprometheusv2 stack (#12323, #12324, #12325
— merged). Legacy endpoint removal, if ever, is a separate change after
usage drains.