feat(telemetry): clickhouse read backend - #92
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Add ClickHouse as a telemetry backend read via @clickhouse/client, normalizing rows to the shared Span type like the other providers. - infra: docker-compose (clickhouse-server + otelcol-contrib), collector config, and init schema owned by loupe (create_schema=false): wide otel_traces with promoted MATERIALIZED columns, a time-ordered projection and FirstInputPreview for body-free list scans, the trace_summary MV for getTrace windows, and the trace_list parameterized view. - trace_list centralizes per-trace domain rules once; identity/root columns use argMinIf(x, Timestamp, cond) rather than max(String). Validated against 843k live spans: 0 diffs vs the prior maxIf query, 103ms full-range page. - provider: getTrace/getSession/listTraces/listSessions/listSpans/listLogs plus tool/agent analytics; values bound as params (chString escapes the few inlines, backslash-safe unlike DataFusion's sqlString).
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