chore(deps): consolidate Nuxt and npm updates

[dependabot]

Consolidates the open npm Dependabot updates onto the Nuxt 4.5.1 security update.

Included direct updates:

• @nuxt/content 3.15.2
• @nuxtjs/sitemap 8.3.x
• Nuxt 4.5.1
• @types/node 26.1.2
• ESLint 10.8.0
• Prettier 3.9.6
• vue-tsc 3.3.x

Included transitive security and bugfix updates:

• socket.io-parser 4.2.7
• brace-expansion 2.1.4 / 5.0.9
• tar 7.5.22
• fast-xml-parser 5.10.1
• js-yaml 4.3.1

Compatibility decisions:

• Keeps TypeScript at 6.0.3 instead of the grouped TypeScript 7 update.
• Keeps better-sqlite3 at 12.11.1 because @nuxt/content 3.15.2 requires ^12.5.0.
• Pins nostics 1.2.0 at the root to prevent Nuxt production imports from resolving devframe’s incompatible nostics 0.2.0 copy.

Verification:

• npm ci
• npm run build
• npm run lint
• npm run format:check
• npm audit --audit-level=high (0 vulnerabilities)