feat(phase-37): timer pause/resume + professional reporting engine

Pause/Resume timer:
- Add paused_at, red_paused_seconds, blue_paused_seconds fields to Test model
- Add pause_timer/resume_timer workflow functions with accumulated pause tracking
- Auto-resume on phase submit; subtract paused time from worklog duration
- Add POST /tests/{id}/pause-timer and resume-timer endpoints
- Update LiveTimer component with pause/resume button and paused visual state
- Wire pause/resume mutations through TestDetailPage and TestDetailHeader

Professional Reporting Engine - Fase 2:
- Add ReportEngine service with Jinja2 HTML rendering, WeasyPrint PDF, and docxtpl DOCX
- Add corporate CSS stylesheet with cover page, data tables, stats grid, findings
- Create purple_campaign, coverage_report, and executive_summary HTML templates
- Add report_generation_service collecting domain data for each report type
- Add professional_reports router: GET /reports/generate/purple-campaign/{id}, coverage-summary, executive-summary
- Add analytics router with flat JSON endpoints for PowerBI: /coverage, /tests, /trends, /operators
- Add advanced_metrics router: /coverage-by-tactic, /never-tested, /avg-validation-time, /detection-rate-trend
- Add weasyprint and docxtpl to requirements.txt
- Add REPORT_TEMPLATES_DIR, REPORT_OUTPUT_DIR, COMPANY_NAME, COMPANY_LOGO_PATH to config

backend/app/main.py

@@ -34,6 +34,9 @@ from app.routers import compliance as compliance_router
 from app.routers import snapshots as snapshots_router
 from app.routers import jira as jira_router
 from app.routers import worklogs as worklogs_router
+from app.routers import professional_reports as professional_reports_router
+from app.routers import analytics as analytics_router
+from app.routers import advanced_metrics as advanced_metrics_router
 from app.domain.exceptions import DomainException
 from app.middleware.error_handler import domain_exception_handler
 from app.storage import ensure_bucket_exists
@@ -114,6 +117,9 @@ app.include_router(compliance_router.router, prefix="/api/v1")
 app.include_router(snapshots_router.router, prefix="/api/v1")
 app.include_router(jira_router.router, prefix="/api/v1")
 app.include_router(worklogs_router.router, prefix="/api/v1")
+app.include_router(professional_reports_router.router, prefix="/api/v1")
+app.include_router(analytics_router.router, prefix="/api/v1")
+app.include_router(advanced_metrics_router.router, prefix="/api/v1")
 
 
 @app.get("/health", include_in_schema=False)