Stronger model typings

server/controllers/activitypub/client.ts

server/controllers/activitypub/inbox.ts

server/controllers/activitypub/outbox.ts

server/controllers/api/search.ts

server/controllers/api/users/index.ts

server/controllers/api/users/me.ts

server/controllers/api/users/my-history.ts

server/controllers/api/video-channel.ts

server/controllers/api/video-playlist.ts

server/controllers/api/videos/abuse.ts

server/controllers/api/videos/blacklist.ts

server/controllers/api/videos/captions.ts

server/controllers/api/videos/comment.ts

server/controllers/api/videos/import.ts

server/controllers/api/videos/index.ts

server/controllers/api/videos/ownership.ts

server/controllers/api/videos/rate.ts

server/controllers/api/videos/watching.ts

server/controllers/feeds.ts

server/controllers/services.ts