Feat: Comprehensive input validation, backend rule tightening, database migration update
- Add comprehensive validation to 9+ CRUD forms (error summaries, field-level validation, character counters, submit gating)
- Audit all 67 Blade files for validation coverage and remediate missing validations
- Tighten backend validation rules: min:3 enforcement on all name/major fields across AdminController, BKController, AlumniController, ProfileUpdateRequest
- Update jurusan_polije table migration to match current database structure
- Restore database from backup: 9 jurusan, 10 recommendations, 20 chat histories
- Verify 49/49 PHPUnit tests passing (122 assertions, 100% success rate)
- Clean up development/test documentation files
- Status: Production ready for sidang (thesis defense)
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