first commit

Repos/PairingCodeRepo.cs

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+using Fitness_core_BE.Interfaces;
+using Fitness_core_BE.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Fitness_core_BE.Repos
+{
+    public class PairingCodeRepo : IPairingCodeRepo
+    {
+        // Central: created by platform Admin (no TenantId claim) and redeemed by an anonymous
+        // agent enroll call (no tenant context at all yet). See CentralDbContext.PairingCodes.
+        private readonly CentralDbContext _dbContext;
+
+        public PairingCodeRepo(CentralDbContext dbContext)
+        {
+            _dbContext = dbContext;
+        }
+
+        public async Task<PairingCode> AddAsync(PairingCode pairingCode)
+        {
+            await _dbContext.PairingCodes.AddAsync(pairingCode);
+            return pairingCode;
+        }
+
+        // Active = not used and not expired.
+        public async Task<PairingCode?> GetActiveByCodeAsync(string code)
+        {
+            var now = DateTime.UtcNow;
+            return await _dbContext.PairingCodes
+                .FirstOrDefaultAsync(p => p.Code == code && !p.IsUsed && p.ExpiresAt > now);
+        }
+
+        public Task MarkUsedAsync(PairingCode pairingCode)
+        {
+            pairingCode.IsUsed = true;
+            _dbContext.PairingCodes.Update(pairingCode);
+            return Task.CompletedTask;
+        }
+    }
+}