Audit admin list search pagination and session filters beyond requests

[Taleef7]

Context

docs/plan-CorvEd.md calls out admin filtering/search improvements, and advisor_update.md notes that some admin lists may lack search/pagination. Issue #124 covers text search for admin requests specifically; this issue covers the rest of the admin operating surface, especially sessions.

Acceptance criteria

• Inventory /admin/users, /admin/requests, /admin/payments, /admin/tutors, /admin/matches, /admin/sessions, /admin/audit, and /admin/analytics for search, pagination, and useful filters.
• Add or plan missing filters where they reduce operator friction, prioritizing /admin/sessions by match/student, date range, and status.
• Ensure query params are stable and shareable.
• Preserve responsive behavior and avoid N+1 queries when filters are added.
• Update docs or close as not-planned for lists where filtering is intentionally unnecessary.

References

• docs/plan-CorvEd.md section 4.3 operational tooling
• advisor_update.md UX / polish: No search/pagination on all admin lists
• Issue Add text search by student name and subject to admin requests #124