feat: add OpenTelemetry HTTP tracing support#114
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Introduces a new `extotel` package that initializes the OpenTelemetry SDK from standard OTEL_* environment variables, and wires `otelhttp` into the `exthttp.RegisterHttpHandler` middleware chain so every incoming request produces a `METHOD /path` span. When OTEL is not configured the global noop provider keeps the instrumentation zero-cost, so existing consumers are unaffected.
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Introduces a new
extotelpackage that initializes the OpenTelemetry SDK from standard OTEL_* environment variables, and wiresotelhttpinto theexthttp.RegisterHttpHandlermiddleware chain so every incoming request produces aMETHOD /pathspan. When OTEL is not configured the global noop provider keeps the instrumentation zero-cost, so existing consumers are unaffected.