100 gated gifts (level/rating-locked) + requirement system

Adds ~100 new purchasable gifts that are LOCKED until a level/rating gate is met,
then buyable with coins — value scales with the gate:
- 45 gift avatars (types.ts), 35 gift titles + 20 gift card backs (gamification.ts),
  all reusing existing renderers. Tier (1-5) encoded in the id (-t<n>-).
- Gate model: GIFT_TIERS (shared) → reqLevel/reqRating on AvatarDef/TitleDef/
  CardBackDef + ShopItem. Tiers: t1 free, t2 Lv10, t3 Lv20, t4 Lv35, t5 Rating1700.
- Shop UI: locked cards dim + show the requirement (Lock + "Level 20"), buy
  disabled until met; mock buyItem enforces it offline.
- Server enforces generically — ProfileService parses the tier from the id and
  checks the player's level/rating (no 100-entry mirror). Mirrors GIFT_TIERS.
- i18n shop.reqLevel/reqRating (fa+en).

Verified: tsc + sim + next build + dotnet build all pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/src/Hokm.Server/Profiles/ProfileService.cs

@@ -125,10 +125,28 @@ public class ProfileService
         ["xp3"] = (8000, 1500),
     };
 
+    // Gated gifts encode their tier in the id (`-t<n>-`); the gate is derived from
+    // the tier so the server enforces it without a 100-entry catalog mirror.
+    // Mirrors GIFT_TIERS in src/lib/online/types.ts.
+    private static readonly (int Level, int Rating)[] GiftGate =
+        { (0, 0), (0, 0), (10, 0), (20, 0), (35, 0), (0, 1700) }; // index = tier (1..5)
+
+    private static (int Level, int Rating) GiftGateFor(string id)
+    {
+        var m = System.Text.RegularExpressions.Regex.Match(id, @"-t(\d)-");
+        if (m.Success && int.TryParse(m.Groups[1].Value, out var tier) && tier >= 1 && tier <= 5)
+            return GiftGate[tier];
+        return (0, 0);
+    }
+
     public async Task<(bool ok, ProfileDto? profile, string error)> ShopBuy(string uid, string kind, string id, int price)
     {
         var p = await GetOrCreate(uid, null);
 
+        // Gated gift: locked until the player meets the tier's level/rating gate.
+        var gate = GiftGateFor(id);
+        if (p.Level < gate.Level || p.Rating < gate.Rating) return (false, p, "locked");
+
         // XP packs are consumable (grant XP, may level up) — not added to an owned list.
         if (kind == "xp")
         {