Add DAO member filtering and sorting

[ManhND226677]

Summary

• add account-name filtering for DAO members on the DAO page
• add sorting by voting power, newest joined, staked EFX, staked NFX, and account name
• show member EFX/NFX stake values on the member cards so sort results are visible

Fixes #106.

Verification

• npx eslint --ext .vue pages/dao.vue (passes with existing warnings in the file)
• git diff --check
• npm run build (fails in this local environment because node-sass@4.14.1 does not support Node runtime 137; this repository declares Node 14.21.3/npm 6.14.11. The local install also reports unrelated simplemde/codemirror and marked bundling errors.)

[ManhND226677]

Added a follow-up polish commit:\n\n- Robust numeric parsing for sorting by votes/EFX/NFX (handles numeric strings safely).\n- Case-insensitive account sorting.\n- Improved member stake row layout for better readability on narrow widths.\n\nThis keeps the filtering/sorting behavior unchanged while making it more resilient and easier to scan in the member cards.