Lab #1163: OTel setup manual example (OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317) cannot work — exporter is OTLP/HTTP-only, needs port 4318

The how-to at /manual/how-to/set-up-opentelemetry shows:

OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317

But swamp's tracer (src/infrastructure/tracing/otel_init.ts) builds a fetch-based OTLP/HTTP exporter (FetchOtlpExporter) that POSTs to ${endpoint}/v1/traces. There is no gRPC exporter, and OTEL_EXPORTER_OTLP_PROTOCOL is never read.

Port 4317 is the OTLP/gRPC port; OTLP/HTTP is 4318. So pointing swamp at :4317 makes it HTTP-POST to a gRPC listener and every span is silently dropped (no error logged).

Verified empirically against a stock otel/opentelemetry-collector-contrib collector (otlp receiver, grpc+http):

OTEL_EXPORTER_OTLP_ENDPOINT=http://:4318 -> spans arrive in ClickHouse
OTEL_EXPORTER_OTLP_ENDPOINT=http://:4317 -> nothing arrives, exit 0, empty stderr

Requested fix:

Change the manual example to http://localhost:4318.
Document that swamp is OTLP/HTTP-only: the endpoint is a base URL to which /v1/traces is appended, and OTEL_EXPORTER_OTLP_PROTOCOL is ignored.
Optional: warn when the configured endpoint host:port looks like the gRPC port (4317).

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