feat(FR-2451): add prometheus tab scaffolding to AdminServingPage

[agatha197]

Resolves #6357 (FR-2451)

Summary

This is Sub-task 1 of 5 in the FR-2451 stack delivering Prometheus Query Preset admin CRUD. It is the foundation PR — it adds the new tab entry but renders only a placeholder; subsequent PRs in the stack fill in the list, create modal, edit modal with live preview, and delete flow.

Changes

• Add a new auto-scaling-rule tab to AdminServingPage's tabList, gated behind isSuperAdmin (mirrors the existing model-store gating pattern).
• Render a placeholder AutoScalingRulePresetTab component (lazy-loaded, wrapped in BAIErrorBoundary + Suspense) that currently renders an active Skeleton.
• Add the i18n key webui.menu.AutoScalingRule in resources/i18n/en.json. Other locales will be filled in by /i18n later.
• Stage the dev plan and progress files under .specs/draft-auto-scaling-rule-management/ so the stack's planning context is checked in alongside the first PR.

Files changed

• react/src/pages/AdminServingPage.tsx — add lazy import, tab list entry, lazy render branch
• react/src/components/AutoScalingRulePresetTab.tsx (new) — placeholder component with 'use memo' directive
• resources/i18n/en.json — new webui.menu.AutoScalingRule key
• .specs/draft-auto-scaling-rule-management/dev-plan.md, .specs/draft-auto-scaling-rule-management/.context/progress.md — planning context for the FR-2451 stack

Verification

=== TypeScript ===
--- TypeScript: PASS ---

=== ALL PASS ===

bash scripts/verify.sh passes (Relay + Lint + Format + TypeScript).

Stack

This is the bottom of a 5-PR Graphite stack:

1. (this PR) tab scaffolding
2. preset list (read + filter + pagination)
3. create preset modal
4. edit preset modal + live "Current value" preview
5. delete preset flow

Each subsequent PR is gated by the previous one and will reuse the placeholder component as the mount point for real functionality.

[agatha197]

• test(FR-2451): add E2E tests for prometheus preset CRUD, filter, sort, and table settings #7108 : 2 dependent PRs (#7109 , #7110 )
• feat(FR-2451): polish preset list — BAINameActionCell, copyable QueryTemplate, column settings, i18n #7095
• feat(FR-2451): add Prometheus Query Preset edit modal with live preview #7094
• feat(FR-2451): add Prometheus Query Preset delete confirmation #7086
• feat(FR-2451): add Prometheus Query Preset create modal #7085
• feat(FR-2451): implement Prometheus Query Preset list table #7084
• feat(FR-2451): add prometheus tab scaffolding to AdminServingPage #7082 👈 (View in Graphite)
• main

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[github-actions]

Coverage report for ./react

St.❔	Category	Percentage	Covered / Total
🔴	Statements	9.04% (+0% 🔼)	1859/20570
🔴	Branches	8.19% (-0% 🔻)	1187/14489
🔴	Functions	5.33% (+0.02% 🔼)	297/5577
🔴	Lines	8.77% (+0% 🔼)	1750/19955

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🔴	... / AutoScalingRulePresetTab.tsx	0%	100%	0%	0%

Test suite run success

865 tests passing in 40 suites.

Report generated by 🧪jest coverage report action from e0a386e

[nowgnuesLee]

LGTM