Add Wahoo activity sync with provider-agnostic framework
Provider-agnostic sync framework + Wahoo as first implementation:
Framework (apps/journal/app/lib/sync/):
- SyncProvider interface for OAuth2, webhooks, import, conversion
- Provider registry for settings UI iteration
- Generic sync_connections + sync_imports tables
- Token storage with auto-refresh
Wahoo provider:
- OAuth2 with workouts_read, user_read, offline_data scopes
- Webhook-based auto-import (workout_summary events)
- Manual import page with pagination
- FIT→GPX conversion via fit-file-parser
- Webhook token verification
Routes:
- /api/sync/connect/:provider — OAuth redirect
- /api/sync/callback/:provider — OAuth callback
- /api/sync/disconnect/:provider — remove connection
- /api/sync/webhook/:provider — webhook receiver
- /sync/import/:provider — manual import page
Settings: Connected Services section with per-provider connect/disconnect
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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