Implement leveling rewards feature with UI and backend support

- Added functionality to manage role rewards based on user levels in the leveling system.
- Updated the LevelingForm component to include fields for defining rewards, including validation for unique levels.
- Enhanced backend logic to handle reward data storage and retrieval, ensuring proper integration with the existing leveling configuration.
- Introduced localization keys for rewards in both English and German, improving user experience.
- Updated dashboard search index to include rewards settings for easier access.

packages/shared/src/dashboard.ts

@@ -269,6 +269,12 @@ export type VerificationConfigDashboardPatch = z.infer<typeof VerificationConfig
 
 export const LevelUpModeDashboardSchema = z.enum(['CHANNEL', 'DM', 'OFF']);
 
+export const LevelRewardDashboardSchema = z.object({
+  level: z.number().int().min(1).max(10_000),
+  roleId: SnowflakeSchema
+});
+export type LevelRewardDashboard = z.infer<typeof LevelRewardDashboardSchema>;
+
 export const LevelingConfigDashboardSchema = z.object({
   enabled: z.boolean(),
   textXpMin: z.number().int().positive(),
@@ -283,6 +289,7 @@ export const LevelingConfigDashboardSchema = z.object({
   levelUpChannelId: OptionalSnowflakeSchema,
   levelUpMessage: z.string().max(500).nullable().optional(),
   stackRewards: z.boolean(),
+  rewards: z.array(LevelRewardDashboardSchema).max(100),
   cardAccentColor: z.string().regex(/^#[0-9a-fA-F]{6}$/),
   cardBackgroundColor: z.string().regex(/^#[0-9a-fA-F]{6}$/)
 });
@@ -291,6 +298,18 @@ export type LevelingConfigDashboard = z.infer<typeof LevelingConfigDashboardSche
 export const LevelingConfigDashboardPatchSchema = nonEmptyPatch(LevelingConfigDashboardSchema);
 export type LevelingConfigDashboardPatch = z.infer<typeof LevelingConfigDashboardPatchSchema>;
 
+/** Returns true when every reward level is unique. */
+export function hasUniqueRewardLevels(rewards: LevelRewardDashboard[]): boolean {
+  const levels = new Set<number>();
+  for (const reward of rewards) {
+    if (levels.has(reward.level)) {
+      return false;
+    }
+    levels.add(reward.level);
+  }
+  return true;
+}
+
 // ---------------------------------------------------------------------------
 // Economy
 // ---------------------------------------------------------------------------