chore: add knip

[serhalp]

Note

Low Risk
CI/tooling-only change that adds a static analysis step and new dev dependency; no runtime or production logic changes.

Overview
Adds knip to the repo and wires it into CI via a new GitHub Actions workflow that runs on pushes to main and all PRs.

Introduces knip.config.ts with custom Nuxt 4 app/ + server/ entry globs and dependency/binary ignore lists, plus a pnpm run knip script and lockfile updates for the new dev dependency.

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[github-actions]

⚠️ Dependency Count

This PR adds 27 new dependencies (1371 → 1398), which exceeds the threshold of 10.

📊 Dependency Size Changes

📦 Package	📏 Size
@oxc-resolver/binding-linux-x64-gnu@11.17.1	2.5 MB
knip@5.83.1	1.6 MB
smol-toml@1.6.0	103.2 kB
oxc-resolver@11.17.1	58.8 kB
formatly@0.3.0	21.6 kB
strip-json-comments@5.0.3	8.2 kB
fd-package-json@2.0.0	7.7 kB
walk-up-path@4.0.0	6.1 kB

Total size change: 4.3 MB

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Redundant server entry patterns subsumed by catch-all

Low Severity

The four specific server globs (server/api/**/*.ts, server/routes/**/*.ts, server/middleware/**/*.ts, server/plugins/**/*.ts) are completely redundant because server/**/*.ts on line 21 already matches every .ts file under server/, including all files those patterns would match. The specific patterns add no filtering value and only create maintenance overhead.