feat: Add configurable draw cycles, improve UX

Backend:
- Add configurable draw cycle settings (minutes/hourly/daily/weekly/custom)
- Add CYCLE_TYPE, CYCLE_INTERVAL_*, CYCLE_DAILY_TIME, CYCLE_WEEKLY_* env vars
- Add SALES_CLOSE_BEFORE_DRAW_MINUTES and CYCLES_TO_GENERATE_AHEAD
- Fix SQLite parameter issue in scheduler

Frontend:
- Add 'Save This Link' section with copy button on ticket status page
- Improve draw animation to show immediately when draw starts
- Show 'Waiting for next round...' instead of 'Drawing Now!' after draw
- Hide Buy Tickets button when waiting for next round
- Skip draw animation if no tickets were sold
- Keep winner screen open longer (15s) for next cycle to load
- Auto-refresh to next lottery cycle after draw

Telegram Bot:
- Various improvements and fixes

front_end/src/app/tickets/[id]/page.tsx

@@ -18,6 +18,21 @@ export default function TicketStatusPage() {
   const [error, setError] = useState<string | null>(null);
   const [data, setData] = useState<any>(null);
   const [autoRefresh, setAutoRefresh] = useState(true);
+  const [copied, setCopied] = useState(false);
+
+  const ticketUrl = typeof window !== 'undefined' 
+    ? `${window.location.origin}/tickets/${ticketId}`
+    : '';
+
+  const copyLink = async () => {
+    try {
+      await navigator.clipboard.writeText(ticketUrl);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    } catch (err) {
+      console.error('Failed to copy:', err);
+    }
+  };
 
   useEffect(() => {
     loadTicketStatus();
@@ -86,6 +101,48 @@ export default function TicketStatusPage() {
         {STRINGS.ticket.title}
       </h1>
 
+      {/* Save This Link */}
+      <div className="bg-gradient-to-r from-blue-900/30 to-purple-900/30 border border-blue-700/50 rounded-xl p-6 mb-6">
+        <div className="flex items-start gap-4">
+          <div className="text-3xl">🔖</div>
+          <div className="flex-1">
+            <h3 className="text-lg font-semibold text-white mb-2">Save This Link!</h3>
+            <p className="text-gray-300 text-sm mb-3">
+              Bookmark or save this page to check if you've won after the draw. This is your only way to view your ticket status.
+            </p>
+            <div className="flex flex-col sm:flex-row gap-2">
+              <div className="flex-1 bg-gray-800/80 rounded-lg px-3 py-2 font-mono text-sm text-gray-300 break-all">
+                {ticketUrl || `/tickets/${ticketId}`}
+              </div>
+              <button
+                onClick={copyLink}
+                className={`px-4 py-2 rounded-lg font-medium transition-all flex items-center justify-center gap-2 ${
+                  copied 
+                    ? 'bg-green-600 text-white' 
+                    : 'bg-blue-600 hover:bg-blue-500 text-white'
+                }`}
+              >
+                {copied ? (
+                  <>
+                    <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
+                    </svg>
+                    Copied!
+                  </>
+                ) : (
+                  <>
+                    <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" />
+                    </svg>
+                    Copy Link
+                  </>
+                )}
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
+
       {/* Purchase Info */}
       <div className="bg-gray-900 rounded-xl p-6 mb-6 border border-gray-800">
         <div className="grid grid-cols-2 gap-4 text-sm">