Use slider for up to 32 service replicas

[arjunkomath]

Summary

• add the shadcn/Base UI slider primitive and use it for automatic replica selection
• raise the service replica ceiling from 10 to 32 across UI, web validation, rollout execution, Compose parsing, public API, and CLI manifests
• update documentation and boundary coverage for 32 accepted / 33 rejected

Validation

• mise exec node@24 -- npx vitest run tests/autoplacement.test.ts tests/public-api-source.test.ts tests/service-revision-spec.test.ts (65 tests)
• ./node_modules/.bin/tsc --noEmit
• go test ./... in cli/
• Biome and gofmt checks
• git diff --check

Basecamp

• https://app.basecamp.com/5890597/buckets/47439993/todos/10143069415

[github-actions]

React Doctor found no issues. 🎉

⚠️ Warning: .github/workflows/react-doctor.yml is configured incorrectly. See below to fix.

React Doctor compares against main to report only the issues this pull request introduces. This run couldn't complete that comparison (usually a shallow CI checkout with no merge base), so it listed every issue in the changed files, including ones that already existed on main.

Add fetch-depth: 0 to the actions/checkout step in .github/workflows/react-doctor.yml so the checkout includes the history React Doctor needs:

 jobs:
   react-doctor:
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0

       - uses: millionco/react-doctor@v2

To silence this warning, set silence-missing-baseline-warning: true on the React Doctor action.

_{Reviewed by React Doctor for commit 5a23697.}

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Project	Status	Preview	Updated (UTC)
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