✨ Realm tags and discovery

DysonNetwork.Sphere/Discovery/DiscoveryController.cs

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+using System.Collections.Generic;
+using System.Threading.Tasks;
+using DysonNetwork.Sphere.Realm;
+using Microsoft.AspNetCore.Mvc;
+
+namespace DysonNetwork.Sphere.Discovery;
+
+[ApiController]
+[Route("discovery")]
+public class DiscoveryController(DiscoveryService discoveryService) : ControllerBase
+{
+    [HttpGet("realms")]
+    public Task<List<Realm.Realm>> GetPublicRealms([FromQuery] string? query, [FromQuery] List<string>? tags)
+    {
+        return discoveryService.GetPublicRealmsAsync(query, tags);
+    }
+}

DysonNetwork.Sphere/Discovery/DiscoveryService.cs

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+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using DysonNetwork.Sphere;
+using DysonNetwork.Sphere.Realm;
+using Microsoft.EntityFrameworkCore;
+
+namespace DysonNetwork.Sphere.Discovery;
+
+public class DiscoveryService(AppDatabase appDatabase)
+{
+    public Task<List<Realm.Realm>> GetPublicRealmsAsync(string? query, List<string>? tags)
+    {
+        var realmsQuery = appDatabase.Realms
+            .Where(r => r.IsPublic);
+
+        if (!string.IsNullOrEmpty(query))
+        {
+            realmsQuery = realmsQuery.Where(r => r.Name.Contains(query) || r.Description.Contains(query));
+        }
+
+        if (tags != null && tags.Count > 0)
+        {
+            realmsQuery = realmsQuery.Where(r => r.RealmTags.Any(rt => tags.Contains(rt.Tag.Name)));
+        }
+
+        return realmsQuery.ToListAsync();
+    }
+}