feat(web): Tools page lists the tenant's published tool packages from stock registry assets (CL-8443)

[TheGreatAxios]

Summary

• The Tools page called listCapabilityInventory against a hub route that no longer exists (/api/tenants/:t/agent-definitions/capabilities/inventory) — the last deleted-route reference in apps/web.
• Rebuilt it on stock data: GET /api/tenants/:t/assets?kind=package-registry&inherited=false to find the tenant's own registry assets, then GET /:assetId/tarballs on each for the published tarball filenames, parsed into name + version.
• Deleted listCapabilityInventory / CapabilityInventory from agents-api.ts (no other caller).
• Page now reads through useToolPackages (TanStack useQuery, arktype-parsed) and QueryView — no useEffect.

Gap

• Stock read routes only list tarball filenames (no packument route), so description and declared tool names from a package's manifest are not shown — only name and version, recovered from the <name>-<version>.tgz filename registry-publish.ts writes.

Test plan

• bun install
• bunx tsc -p apps/web --noEmit
• bun run fmt / bun run lint
• grep -rn "agent-definitions" apps/web/src — empty

[linear-code]

CL-8443