Migrate to Mediato

[skrasekmichael]

• migrated from MediatR to Mediator (Migrate away from MediatR #60)
• improved logging and debug logging
• fixed some potential concurrency problems in testing
• formatting changes

[Copilot]

Pull Request Overview

This PR migrates the codebase from MediatR to Mediato, revising the messaging patterns and command invocations while also including logging improvements and test concurrency fixes.

• Replaced MediatR with Mediato.Abstractions and updated endpoint dependencies from ISender to IRequestSender.
• Updated all command invocations to use asynchronous SendAsync with proper generic type parameters.
• Adjusted package dependencies in Directory.Packages.props for Mediato and related libraries.

Reviewed Changes

Copilot reviewed 94 out of 94 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/TeamUp.Api/Endpoints/Teams/UpdateTeamMemberRoleEndpoint.cs	Updated MediatR dependency and command invocation.
src/TeamUp.Api/Endpoints/Teams/RemoveTeamMemberEndpoint.cs	Updated DI and command call pattern.
src/TeamUp.Api/Endpoints/Teams/GetUserTeamsEndpoint.cs	Updated query sending with IRequestSender.
src/TeamUp.Api/Endpoints/Teams/GetTeamEndpoint.cs	Replaced synchronous Send with SendAsync and updated DI.
src/TeamUp.Api/Endpoints/Teams/DeleteTeamEndpoint.cs	Updated command sending from MediatR to Mediato pattern.
src/TeamUp.Api/Endpoints/Teams/CreateTeamEndpoint.cs	Updated dependency and command invocation.
src/TeamUp.Api/Endpoints/Teams/CreateEventTypeEndpoint.cs	Updated command sending with new sender interface.
src/TeamUp.Api/Endpoints/Teams/ChangeOwnerShipEndpoint.cs	Updated DI; note potential naming inconsistency with "Ownership".
src/TeamUp.Api/Endpoints/Teams/ChangeNicknameEndpoint.cs	Updated dependency and asynchronous command call.
src/TeamUp.Api/Endpoints/Invitations/RemoveInvitationEndpoint.cs	Updated DI and command invocation.
src/TeamUp.Api/Endpoints/Invitations/InviteUserEndpoint.cs	Updated dependency and command call pattern.
src/TeamUp.Api/Endpoints/Invitations/GetTeamInvitationsEndpoint.cs	Updated query sending with new interface.
src/TeamUp.Api/Endpoints/Invitations/GetMyInvitationsEndpoint.cs	Updated endpoint dependency and asynchronous query sending.
src/TeamUp.Api/Endpoints/Invitations/AcceptInvitaionEndpoint.cs	Updated dependency and asynchronous command sending; potential typo in file name.
src/TeamUp.Api/Endpoints/Events/UpsertEventReplyEndpoint.cs	Updated DI and command invocation pattern.
src/TeamUp.Api/Endpoints/Events/RemoveEventEndpoint.cs	Updated dependency and fixed command call with SendAsync.
src/TeamUp.Api/Endpoints/Events/GetEventsEndpoint.cs	Updated asynchronous query sending with new sender.
src/TeamUp.Api/Endpoints/Events/GetEventEndpoint.cs	Updated DI and query sending method.
src/TeamUp.Api/Endpoints/Events/CreateEventEndpoint.cs	Updated dependency and asynchronous command invocation.
Directory.Packages.props	Removed MediatR package and added Mediato and related RailwayResult packages.

Comments suppressed due to low confidence (2)

src/TeamUp.Api/Endpoints/Teams/ChangeOwnerShipEndpoint.cs:1

• The file name 'ChangeOwnerShipEndpoint.cs' uses an inconsistent spelling compared to the command 'ChangeOwnershipCommand'. Consider renaming the file to 'ChangeOwnershipEndpoint.cs' for consistency.

using Mediato.Abstractions;

src/TeamUp.Api/Endpoints/Invitations/AcceptInvitaionEndpoint.cs:1

• The file name 'AcceptInvitaionEndpoint.cs' appears to have a typo ('Invitaion' instead of 'Invitation'). Consider renaming it to 'AcceptInvitationEndpoint.cs'.

using Mediato.Abstractions;