feat: Enhance UgcPurchasablesController to handle bulk requests with object arrays

- Updated Bulk method to parse incoming JSON object arrays for UGC item IDs.
- Introduced ReadBulkIdsAsync to handle both object arrays and flat GUID lists.
- Added synthetic placeholder responses for missing UGC items to prevent client errors.

feat: Implement MatchmakeRoom and MatchmakeSubRoom endpoints in GoToController

- Added MatchmakeRoom and MatchmakeSubRoom methods to facilitate joining public and sub-rooms by numeric ID.
- Enhanced ApplySubRoomMutation to ensure proper state transitions for sub-rooms.
- Improved logging for matchmaking actions.

fix: Refactor PlayerSettingsController to handle database save exceptions

- Introduced SaveSettingsChangesAsync to manage DbUpdateException for busy SQLite scenarios.
- Updated methods to call SaveSettingsChangesAsync instead of direct SaveChangesAsync.

chore: Update URL coverage documentation for new matchmaking endpoints

- Documented new MatchmakeRoom and MatchmakeSubRoom endpoints in url-coverage.md.

chore: Add default room data file for room loading

- Included default_room.room to serve as a fallback for missing room data.

fix: Improve SQLite concurrency handling in DatabaseBootstrap

- Configured SQLite to use WAL mode and set a busy timeout for better concurrency.

chore: Create SqliteErrors utility for handling SQLite exceptions

- Added SqliteErrors class to encapsulate logic for detecting busy SQLite exceptions.

refactor: Update RoomDataBlobService to serve default room data

- Modified GetDefaultBlob to load and serve a default room blob with proper role data.

DorkNet.Server/Startup/ServiceCollectionExtensions.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.Data.Sqlite;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.IdentityModel.Tokens;
 using DorkNet.Server.Compat;
@@ -88,7 +89,14 @@ public static class ServiceCollectionExtensions
                 if (string.IsNullOrWhiteSpace(dbPath))
                     dbPath = Path.Combine(AppContext.BaseDirectory, "data", "dorknet.db");
                 Directory.CreateDirectory(Path.GetDirectoryName(dbPath)!);
-                opt.UseSqlite($"Data Source={dbPath}", lite => lite.MigrationsAssembly("DorkNet.Server"));
+                var conn = new SqliteConnectionStringBuilder
+                {
+                    DataSource = dbPath,
+                    Mode = SqliteOpenMode.ReadWriteCreate,
+                    Cache = SqliteCacheMode.Shared,
+                    DefaultTimeout = 30,
+                }.ToString();
+                opt.UseSqlite(conn, lite => lite.MigrationsAssembly("DorkNet.Server"));
             }
         });
     }