Add match result webhook configuration to profile page

[tetsuo-matsumura]

Summary

Adds a webhook URL field to the user profile page, allowing players to configure a personal endpoint that receives their match result payload after each game finishes.

• src/interface/API/MatchResultWebhookAPI.php.ts — new request/response types for the webhook API
• src/interface/API/UserProfileAPI.php.ts — added matchResultWebhookUrl?: string to the profile response shape
• src/appConstants.ts — added MATCH_RESULT_WEBHOOK endpoint to URL_END_POINT
• src/features/api/apiSlice.ts — added setMatchResultWebhook RTK Query mutation (useSetMatchResultWebhookMutation)
• src/routes/user/profile/index.tsx — webhook section with pre-populated input (synced from profile data via useEffect), save handler with toast feedback, placed after the Patreon section
• src/routes/user/profile/profile.module.css — webhookSection and webhookInputRow styles matching the existing Patreon/Metafy card style

Backend PR

This is the frontend half of the feature. The backend changes (new API endpoint, database migration, match-end delivery logic, SSRF validation) are in:

Talishar/Talishar#1391 — Add user-configurable match result webhooks

The backend PR also includes a small update to UserProfileAPI.php to return matchResultWebhookUrl in the profile response, which is what pre-populates the input field here.

Test plan

• Load /user/profile while logged in — webhook input renders in the left column after Patreon
• If a webhook URL was previously saved, the input is pre-populated
• Enter a valid URL and click Save — toast confirms success
• Clear the input and click Save — toast confirms webhook cleared
• Backend returns a validation error (e.g. bare IP, bad scheme) — error message appears as a toast
• Network error — generic error toast shown, page does not break
• Verify layout on mobile (≤575px) — input and button stack vertically

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