feat(03-05): technician service, compensation service, APIs, and 27 passing tests
- technician-service.ts: createTechnicianProfile, updateTechnicianProfile, getTechnicianProfile, getTechnicianProfileByUserId, listTechnicians
- compensation-service.ts: getCompensationSummary (all 3 models), getTechnicianCompensationDetail (job-by-job)
- 6 API routes: GET/POST /api/technicians, GET/PUT /api/technicians/[id], GET /api/technicians/[id]/compensation, GET/POST /api/job-type-rates, PUT /api/job-type-rates/[id], GET /api/reports/compensation
- Added TechnicianProfile and JobTypeRate to CASL AppSubjects; OFFICE_STAFF read access
- 27 integration tests: all 3 models, missing rate defaults to 0, only COMPLETED count, date range filter, summary+detail reports, cross-tenant isolation — all green
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