feat(sprint1-step3b): backend save system + anti-cheat + données rattrapées

- game_saves table + migration 002 (JSON state, anti-cheat metadata)
- saveControllers.js : load/save avec validation delta ressources (750k/s × 1.1)
- GameSaveManager : upsert MySQL ON DUPLICATE KEY UPDATE
- useSaveSync hook : auto-save 30s + keepalive beforeunload + guest fallback
- save-validation.test.ts : 8 tests anti-cheat
- economy.ts : arbre d'évolution 5 nœuds + prestige ADN (rattrapage step 2)
- economy.test.ts : +40 tests (évolution tree, multipliers, start bonus)
- GDD + SPRINT1.md : docs sprint complètes
- Rethème data : shop.json, Achievements.json, Cookie, Legal (rattrapage step 1)

Frontend/public/robots.txt

@@ -1,4 +1,4 @@
-Sitemap: https://xmass.click/sitemap.xml
+Sitemap: https://clickerz.tetardtek.com/sitemap.xml
 
 User-agent: AlphaSeoBot 
 User-agent: AlphaSeoBot-SA 

Frontend/public/sitemap.xml

@@ -4,22 +4,20 @@
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
             http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
-<!-- created with Free Online Sitemap Generator www.xml-sitemaps.com -->
-
 
 <url>
-  <loc>https://www.xmass.click/</loc>
-  <lastmod>2023-08-15T19:22:16+00:00</lastmod>
+  <loc>https://clickerz.tetardtek.com/</loc>
+  <lastmod>2026-03-20T12:00:00+00:00</lastmod>
   <priority>1.00</priority>
 </url>
 <url>
-  <loc>https://www.xmass.click/boutique</loc>
-  <lastmod>2023-08-15T19:22:16+00:00</lastmod>
+  <loc>https://clickerz.tetardtek.com/boutique</loc>
+  <lastmod>2026-03-20T12:00:00+00:00</lastmod>
   <priority>0.80</priority>
 </url>
 <url>
-  <loc>https://www.xmass.click/achievements</loc>
-  <lastmod>2023-08-15T19:22:16+00:00</lastmod>
+  <loc>https://clickerz.tetardtek.com/achievements</loc>
+  <lastmod>2026-03-20T12:00:00+00:00</lastmod>
   <priority>0.80</priority>
 </url>
-</urlset>
+</urlset>