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feat(reports): add network throughput chart to database report (#45747)

## Problem

The Database report in Observability has no view of network traffic.
Inbound/outbound throughput is useful for spotting saturation, large
unexpected egress, or correlating spikes with disk I/O.

Closes
[FE-3193](https://linear.app/supabase/issue/FE-3193/add-network-in-and-out-charts).

## Fix

Add a new \`network-throughput\` chart entry to
\`getReportAttributesV2\` in
[apps/studio/data/reports/database-charts.ts](apps/studio/data/reports/database-charts.ts),
placed right before \`disk-iops\`. Uses the existing
\`network_receive_bytes\` and \`network_transmit_bytes\`
infra-monitoring attributes (series already exist, no backend work
needed). Pattern mirrors the \`disk-throughput\` chart: bytes-per-second
Y-axis, \`stackedAreaLine\` default, same \`syncId\`.

\`showMaxValue\` is \`false\` because there is no provisioned network
max to render as a reference line.

## Test plan

- [ ] Open \`/project/<ref>/observability/database\` and confirm a
"Network throughput" chart renders with two series (Network in / Network
out) and a \`bytes/s\` Y-axis.
- [ ] Switch the date range and confirm the chart respects it
(auto-wired via \`REPORT_ATTRIBUTES.flatMap\`).
- [ ] Use the global refresh button and confirm both series invalidate
with the rest.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added a network throughput chart that visualizes inbound and outbound
network throughput metrics with real-time speed data visualization.

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/45747)

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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