feat: add Settings page with hijri seasons CRUD

- Server: seasons CRUD routes + generic NocoDB helpers
- Client: Settings page at /settings with inline add/edit/delete
- Seasons stored in NocoDB Seasons table
- Vite proxy: /api/seasons routed to Express server
- Nav links added (desktop + mobile)
- Locale keys for EN + AR
- Seasons loaded non-blocking on app mount

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/services/seasonsService.ts

@@ -0,0 +1,37 @@
+import type { Season } from '../types';
+
+export async function fetchSeasons(): Promise<Season[]> {
+  try {
+    const res = await fetch('/api/seasons');
+    if (!res.ok) return [];
+    return res.json();
+  } catch {
+    console.warn('Failed to load seasons, using empty list');
+    return [];
+  }
+}
+
+export async function createSeason(season: Omit<Season, 'Id'>): Promise<Season> {
+  const res = await fetch('/api/seasons', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(season),
+  });
+  if (!res.ok) throw new Error('Failed to create season');
+  return res.json();
+}
+
+export async function updateSeason(id: number, season: Partial<Season>): Promise<Season> {
+  const res = await fetch(`/api/seasons/${id}`, {
+    method: 'PUT',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(season),
+  });
+  if (!res.ok) throw new Error('Failed to update season');
+  return res.json();
+}
+
+export async function deleteSeason(id: number): Promise<void> {
+  const res = await fetch(`/api/seasons/${id}`, { method: 'DELETE' });
+  if (!res.ok) throw new Error('Failed to delete season');
+}