Redesign search profile editor

[emnl51]

Summary

• reorganize Search Profile editing around an expanded essentials section and collapsed advanced matching controls
• persist English ability, preferred weekly hours, availability, and target role level as first-class profile fields with legacy migration
• preserve custom search/role/format terms when guided suggestions are applied
• distinguish technician, engineering, and working-student roles during relevance gating
• apply weekly-hours and availability preferences in preferred or strict Search Job modes
• inspect title, available description, hours/workload text, and provider metadata before classifying work time
• hard-exclude unresolved Work time unknown results from part-time and working-student review queues and notifications, including previously stored rows
• recognize Nebenjob and Studentenjob as confirmed German work-type signals
• replace the profile deletion foreign-key 500 with an actionable linked Search Job error
• update Turkish UI strings, README guidance, and the unreleased changelog

Verification

• 246 pytest tests passed
• Ruff check and format check passed
• all JavaScript files passed node --check
• clean diff check
• fresh SQLite startup migration and /health smoke test passed