fix: combine competitor evidence improvements

[arberx]

Supersedes #197 and #199.

What Changed

• combines the tabbed evidence sidebar from feat: tabbed sidebar — Competitors + Sources #197 with the recommendedCompetitors storage/API path from feat: extract and display AI-recommended company names in runs #199
• keeps cited domains visible as canonical evidence instead of replacing them when heuristic company names are present
• tightens competitor-name extraction so it only emits names that line up with cited or matched competitor domains and filters generic headings / the target brand more reliably
• propagates recommendedCompetitors consistently through run detail, project snapshots, contracts, and tests

Why

• #197 had the correct UI separation between competitors and sources
• #199 added useful backend data but replaced cited-domain evidence in the modal and exposed the new field inconsistently across snapshot endpoints
• this PR preserves the evidence model: groundingSources remain raw source records, citedDomains remain canonical citation evidence, and recommendedCompetitors is an additional interpretive layer

Validation

• pnpm exec vitest run packages/canonry/test/job-runner-competitors.test.ts packages/contracts/test/index.test.ts packages/db/test/index.test.ts packages/api-routes/test/index.test.ts
• pnpm --filter @ainyc/canonry-web run typecheck
• pnpm --filter @ainyc/canonry run typecheck
• pnpm --filter @ainyc/canonry-api-routes run typecheck
• pnpm --filter @ainyc/canonry-contracts run typecheck
• pnpm --filter @ainyc/canonry-db run typecheck
• matching lint runs for those same packages