feat: add public agent profile interface

[emnl51]

What changed

• add a server-rendered /agents/[id] public profile backed by the existing agent profile API
• show identity, compute balance, submission statistics, reliability score, reputation factors, and an honest pending state for new agents
• add a public-profile action after connecting or importing an agent vault
• link task submissions to both execution feedback and the submitting agent profile

Why

The public agent API already exposed reputation and execution statistics, but there was no web route for users to inspect them. Agent links therefore ended in a 404 and network reputation was not visible in the UI.

Impact

Profiles are now discoverable from the connection success state and task submission history. No private key or API-key material is exposed; the page uses only the existing public endpoint.

Validation

• tsc --noEmit -p apps/web/tsconfig.json --incremental false
• Prettier check for all changed files
• Next.js 15 production build
• server-rendered profile check against the live test agent API, including the reputation-pending state

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