feat: implement start.gg OAuth integration and services

- Added start.gg OAuth server and session management in startgg.ts
- Implemented functions to fetch recent tournaments and tournament players from start.gg
- Created utility functions for string and country code handling
- Introduced Challonge OAuth server and services for tournament data fetching
- Refactored shared types and utility functions for better organization
- Updated scoreboard graphics to use new country resolution utilities
- Removed legacy startgg.ts file to streamline codebase

shared/utils/string.js

@@ -0,0 +1,28 @@
+export const getStringProp = (payload, key) => {
+    if (typeof payload !== 'object' || payload === null || !(key in payload))
+        return '';
+    const value = payload[key];
+    return typeof value === 'string' ? value.trim() : String(value ?? '').trim();
+};
+export const getNumberProp = (payload, keys) => {
+    for (const key of keys) {
+        const raw = payload[key];
+        if (typeof raw === 'number' && Number.isFinite(raw))
+            return raw;
+        if (typeof raw === 'string') {
+            const parsed = Number(raw);
+            if (Number.isFinite(parsed))
+                return parsed;
+        }
+    }
+    return null;
+};
+export const normalizeTournamentSlug = (value) => {
+    const trimmed = value.trim();
+    if (!trimmed)
+        return '';
+    return trimmed
+        .replace(/^https?:\/\/[^/]+\//i, '')
+        .replace(/^tournaments\//i, '')
+        .replace(/^\/+/, '');
+};