fix: add paused account filter

[LvyuanW]

Summary

• add the missing paused option to the account status filter dropdown in account management
• make paused filtering work end-to-end by treating paused as schedulable=false in frontend and backend filtering
• cover the paused filter with frontend and repository tests

Root Cause

The account management status dropdown did not include the paused state, and paused filtering logic was missing from the account list filter pipeline.

Validation

• env PATH=/Users/apple/.nvm/versions/node/v20.19.5/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pmk/env/global/bin:/Library/Apple/usr/bin:/Users/apple/.codex/tmp/arg0/codex-arg0BeN2uO:/Users/apple/.gvm/pkgsets/go1.25.7/global/bin:/Users/apple/.gvm/gos/go1.25.7/bin:/Users/apple/.gvm/pkgsets/go1.25.7/global/overlay/bin:/Users/apple/.gvm/bin:/opt/homebrew/opt/ffmpeg-full/bin:/Users/apple/.antigravity/antigravity/bin:/Users/apple/.langflow/uv:/Users/apple/.catpawai/bin:/Users/apple/.bun/bin:/Users/apple/.local/bin:/Users/apple/miniconda/bin:/Users/apple/miniconda/condabin:/Users/apple/.jenv/shims:/Users/apple/.jenv/bin:/Users/apple/.sdkman/candidates/maven/current/bin:/Users/apple/.sdkman/candidates/java/current/bin:/Users/apple/.nvm/versions/node/v17.9.1/bin:/Applications/Codex.app/Contents/Resources pnpm exec vitest run src/components/admin/account/tests/AccountTableFilters.spec.ts
• env GOCACHE=/tmp/go-build GOMODCACHE=/tmp/go-mod go test -tags=integration ./internal/repository -run TestAccountRepoSuite/TestListWithFilters