feat(upload): avatar and calendar cover via local disk storage.

POST /v1/user/me/avatar and /v1/calendars/:id/cover; GET /v1/media;
UPLOAD_DIR on eventhub-data volume; MIME/size limits.
Refs EventHub/EventHubBack#71
Refs EventHub/EventHubSpec#8

src/eventhub_app.erl

@@ -83,6 +83,7 @@ start_http() ->
     {'_', [
       {"/metrics/[:registry]", prometheus_cowboy2_handler, []},
       {"/health", handler_health, []},
+      {"/v1/media/:kind/:owner/:file", handler_media, []},
       {"/v1/register", handler_register, []},
       {"/v1/verify", handler_verify, []},
       {"/v1/forgot-password", handler_forgot_password, []},
@@ -91,6 +92,7 @@ start_http() ->
       {"/v1/refresh", handler_refresh, []},
       {"/v1/logout", handler_logout, []},
       {"/v1/user/me", handler_user_me, []},
+      {"/v1/user/me/avatar", handler_user_avatar, []},
       {"/v1/user/bookings", handler_user_bookings, []},
       {"/v1/user/booking-requests", handler_user_booking_requests, []},
       {"/v1/user/studio-bookings", handler_user_studio_bookings, []},
@@ -101,6 +103,7 @@ start_http() ->
       {"/v1/search", handler_search, []},
       {"/v1/calendars", handler_calendars, []},
       {"/v1/calendars/:id", handler_calendar_by_id, []},
+      {"/v1/calendars/:id/cover", handler_calendar_cover, []},
       {"/v1/calendars/:id/follow", handler_calendar_follow, []},
       {"/v1/calendars/:id/specialists", handler_calendar_specialists, []},
       {"/v1/calendars/:id/specialists/:user_id", handler_calendar_specialists, []},