Add activity pagination and filtering

[YfengJ]

Summary

• add a shared activity query helper with bounded limits, cursor pagination, and type/source/severity/entity/actor/from filters
• return paginated activity metadata from the API and storage/service layers
• add activity page filters, empty filtered state, and load-more pagination
• keep the dashboard validation path green by fixing existing duplicate route handlers, API response wrapping, and test env-order blockers

Closes #47

Validation

• pnpm --filter @guildpass/dashboard typecheck
• pnpm --filter @guildpass/dashboard test
• pnpm --filter @guildpass/dashboard lint (warnings only)
• pnpm --filter @guildpass/dashboard build
• git diff --check

[Lakes41]

Good Job
@YfengJ Do resolve conflicts so i can merge

[YfengJ]

Thanks for the review. I rebased this onto the latest main, resolved the conflict/dirty state, and force-pushed the updated branch at 0c38ec5.

I also reran validation locally: dashboard typecheck, full dashboard test suite, lint (warnings only), build, and git diff --check all pass. The PR now shows a CLEAN merge state on my side and is ready for another look.