feat: add public connections API and repository filtering

[brendan-kellam]

Fixes SOU-1870

Summary

• add GET /api/connections with connection metadata scoped through repositories visible to the caller
• add an optional connectionId filter to GET /api/repos, including pagination and count handling
• publish both behaviors in the public OpenAPI specification
• add focused service tests for connection listing and repository filtering

Test plan

• yarn workspace @sourcebot/web test src/app/api/(server)/connections/listConnectionsApi.test.ts src/app/api/(server)/repos/listReposApi.test.ts --run
• yarn workspace @sourcebot/web exec eslint on the changed TypeScript files
• yarn workspace @sourcebot/web openapi:generate

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Note

Low Risk
Additive public read APIs that reuse existing optional-auth and repo-scoping patterns; no new credential exposure beyond id/name/type metadata.

Overview
Adds GET /api/connections, which returns deduplicated code-host connection metadata (id, name, connectionType) for connections tied to at least one repository the caller can see. Listing goes through visible repos so the scoped Prisma client applies the same visibility rules as repository APIs; credentials and connection config are not returned.

GET /api/repos gains an optional connectionId query parameter (positive integer, IDs from the connections endpoint). Repository queries and X-Total-Count use a shared where clause, and pagination Link headers preserve connectionId when present.

Public OpenAPI, docs navigation, and changelog are updated; service tests cover connection deduplication and connection-based repo filtering.

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