klarkxy 60f1532eb8 feat(problemset): add hardness filter and improve query parameter handling ...

- Added hardness filter dropdown in problemset UI with options 1-8
- Implemented server-side hardness parameter validation and filtering
- Refactored query parameter handling to use $filter_params array
- Updated SQL queries to use parameter binding for both search and hardness filters
- Fixed pagination to include hardness parameter in URL
- Improved code organization by centralizing filter parameter management

2026-03-13 15:03:46 +08:00

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