Add rate limiting to AppealController methods

Introduced @RateLimit annotations to enforce request limits on the AppealController. The overall controller has a global limit of 30 requests per hour, while specific methods for Discord and Minecraft appeals are limited to 3 requests per hour. This aims to prevent abuse and improve system reliability.

backend/src/main/java/com/alttd/altitudeweb/controllers/application/AppealController.java

@@ -1,21 +1,29 @@
 package com.alttd.altitudeweb.controllers.application;
 
 import com.alttd.altitudeweb.api.AppealsApi;
+import com.alttd.altitudeweb.controllers.limits.RateLimit;
 import com.alttd.altitudeweb.model.AppealResponseDto;
 import com.alttd.altitudeweb.model.DiscordAppealDto;
 import com.alttd.altitudeweb.model.MinecraftAppealDto;
 import com.alttd.altitudeweb.model.UpdateMailDto;
 import org.springframework.http.HttpStatusCode;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.server.ResponseStatusException;
 
+import java.util.concurrent.TimeUnit;
+
+@RestController
+@RateLimit(limit = 30, timeValue = 1, timeUnit = TimeUnit.HOURS)
 public class AppealController implements AppealsApi {
 
+    @RateLimit(limit = 3, timeValue = 1, timeUnit = TimeUnit.HOURS, key = "discordAppeal")
     @Override
     public ResponseEntity<MinecraftAppealDto> submitDiscordAppeal(DiscordAppealDto discordAppealDto) {
         throw new ResponseStatusException(HttpStatusCode.valueOf(501), "Discord appeals are not yet supported");
     }
 
+    @RateLimit(limit = 3, timeValue = 1, timeUnit = TimeUnit.HOURS, key = "minecraftAppeal")
     @Override
     public ResponseEntity<AppealResponseDto> submitMinecraftAppeal(MinecraftAppealDto minecraftAppealDto) {
         throw new ResponseStatusException(HttpStatusCode.valueOf(501), "Minecraft appeals are not yet supported");