feat: support for lockupViewModel inside of channels' video feed

this is rare and currently a/b tested

ythdd_inv_tl.py

@@ -45,6 +45,7 @@ import ythdd_struct_parser
 # IDEAS:
 # [*] /api/v1/popular returns last requested videos by the IP (serving as multi-device history?)
 # [*] /api/v1/trending returns recently archived videos
+# [*] produce continuations instead of extracting them
 # ----------
 # NOT PLANNED/MAYBE IN THE FUTURE:
 # [ ] /api/v1/auth/subscriptions (stub? db?)
@@ -424,6 +425,7 @@ def videos(data):
 				if is_mix_or_playlist:
 					# neither mixes nor playlists are currently supported by the invidious api
 					continue
+				# note: this model is similar, but not identical to the one in ythdd_struct_parser. perhaps they can be both handled in the struct parser some time.
 				lmvm = safeTraverse(y, ['metadata', 'lockupMetadataViewModel'], default=[])
 				related_entry['videoId']          = safeTraverse(y, ['contentId'])
 				related_entry['title']            = safeTraverse(lmvm, ['title', 'content'])