Fix maintainer dashboard 'Open PRs cached' undercount

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Motivation

• The maintainer dashboard previously summed cached open PRs by filtering listRepoSyncStates(), but that helper is capped at 500 rows and can silently undercount repos whose sync-state rows fall outside the latest 500.
• The intent is to provide a true global count across all in-scope repositories for the Open PRs cached headline metric.

Description

• Add summarizeRepoSyncOpenPullRequests in src/db/repositories.ts that aggregates open_pull_requests_count directly from the repo_sync_state table using a SQL SUM and CASE expressions, and supports optional per-repo scoping; the implementation chunks names (450 per chunk) to avoid parameter limits and uses inArray from drizzle-orm.
• Import inArray from drizzle-orm and expose the new helper from the DB module (src/db/repositories.ts).
• Update the maintainer dashboard handler in src/api/routes.ts to call summarizeRepoSyncOpenPullRequests with the resolved in-scope repository list instead of filtering the capped listRepoSyncStates() result.
• Add an integration test in test/integration/api.test.ts (counts cached open PRs from sync states beyond the latest 500 rows) that seeds an older sync-state row plus 500 newer rows and asserts the dashboard metric counts all of them.

Testing

• Ran type checking with npm run typecheck and it succeeded.
• Ran the focused integration tests with npx vitest run test/integration/api.test.ts -t "cached open PRs" and the tests passed (the targeted tests passed).
• Ran git diff --check as part of validation and there were no whitespace/check errors.

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Codex Task

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