fix(api): add limit/offset pagination and caps to list endpoints (#63)

[ghzhost]

Summary

Resolves #63.

Adds standard, bounded limit and offset pagination to the primary resource listing endpoints (GET /bounties, GET /milestones, GET /maintenance-pools, GET /users).

Changes

• Introduced PaginationQueryDto with @Min(1), @Max(100), and default limit = 20, offset = 0.
• Introduced ListBountiesDto extending pagination query with optional status filter.
• Updated controllers & services for bounties, milestones, maintenance-pool, and users to use findAndCount with take/skip and return { data, total, limit, offset, hasMore }.
• Added unit test suites verifying default limits, max limit clamping (caps at 100), and hasMore pagination calculation.

Acceptance Criteria

• GET /bounties, GET /milestones, GET /maintenance-pools, and GET /users accept and apply limit/offset.
• Enforced max page size of 100 prevents unbounded queries.
• Unit test suites verify pagination bounding and metadata calculation.
• Audited callers: no internal services call list() directly.

[vercel]

Someone is attempting to deploy a commit to the chonilius' projects Team on Vercel.

A member of the Team first needs to authorize it.