Remove unused Service interface that declared CreateVote/DeleteVote methods. These write operations are no longer supported by the AppView. Remove request/response types that were only used by deleted handlers: - CreateVoteRequest - CreateVoteResponse - DeleteVoteRequest Keep only types needed for Jetstream indexing: - Vote (AppView database model) - VoteRecord (atProto record structure) - StrongRef (AT-URI + CID reference) - Repository interface (indexing operations) Add architecture documentation explaining client-direct write pattern. Before: 154 lines After: 99 lines (36% reduction)