Add Daily Rewards & Time Trials features

NEW FEATURES:
- Daily login rewards with Gold and Cash
- Daily time trial racing events
- FREE gold purchase system
- Streak tracking for consecutive days
- Web panel for managing rewards and events

ENDPOINTS ADDED:
- GET/POST /synergy/rewards/daily/{id} - Daily rewards
- POST /synergy/rewards/gold/purchase - Buy gold (FREE)
- GET /synergy/rewards/timetrials - Active events
- POST /synergy/rewards/timetrials/{id}/submit - Submit times

DATABASE:
- DailyReward table - tracks claims and streaks
- TimeTrial table - racing events with rewards
- TimeTrialResult table - player submissions
- User.Gold and User.Cash - currency tracking

WEB PANEL:
- /admin/rewards - Manage all reward features
- Create/edit/activate time trial events
- View reward statistics and history
- Gold packages in catalog (100, 500, 1000, 5000)

FOCUS:
- Single-player progression features
- NO race teams or multiplayer
- Perfect for offline play
- All purchases are FREE in community server

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

RR3CommunityServer/obj/Debug/net8.0/RR3CommunityServer.GeneratedMSBuildEditorConfig.editorconfig

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 build_metadata.AdditionalFiles.TargetPath = UGFnZXNcUHVyY2hhc2VzLmNzaHRtbA==
 build_metadata.AdditionalFiles.CssScope = 
 
+[E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Rewards.cshtml]
+build_metadata.AdditionalFiles.TargetPath = UGFnZXNcUmV3YXJkcy5jc2h0bWw=
+build_metadata.AdditionalFiles.CssScope = 
+
 [E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Sessions.cshtml]
 build_metadata.AdditionalFiles.TargetPath = UGFnZXNcU2Vzc2lvbnMuY3NodG1s
 build_metadata.AdditionalFiles.CssScope =