feat: athlete progress dashboard

[Bit-Bonds]

Summary

• Add weekly training summaries computed from synced Strava activities (distance, pace, HR, elevation, compliance)
• Add race results tracking with PR badges, inline logging from race calendar
• Add coach team progress overview with per-athlete drill-down view
• New database tables: weekly_summaries, race_results with RLS policies

Changes

• Migration: 004_progress.sql with weekly_summaries + race_results tables, indexes, and RLS
• Backend service: progressService.ts with computeWeeklySummary, computeAllWeeks, getComplianceRate, calculatePacePerMile
• Backend routes: progress.ts with 8 endpoints for athlete weekly data, race results CRUD, coach team progress
• Zod schemas: raceResultSchema, raceResultUpdateSchema, weeklyQuerySchema
• Frontend: AthleteProgress page with bar charts, pace trends, current week stats, PR list
• Frontend: CoachTeamProgress page with team table and athlete detail drill-down
• Frontend: RaceCalendar updated with Log Result button, inline result form, results section

Test plan

• Verify weekly summary computation from activity data
• Test race result CRUD (create, update, delete)
• Test coach can view team progress and drill into athlete details
• Verify RLS policies restrict data access appropriately
• Confirm TypeScript compiles clean (backend + frontend)

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