Use shared buteo-common and split notifications service on mainmain

Keep main as the branch that builds against the newer shared social sync modules, while master stays self-contained.

- drop the bundled buteo-common sources and stop building or packaging libmastodonbuteocommon
- link the Mastodon sync plugins against buteosocialcommon and add the matching build/runtime package requirements
- install a dedicated mastodon-notifications account service and wire account creation/packaging around the separate notifications profile
- move the posts/events-view side over to the newer shared-helper style used with the updated socialcache stack
- clean up qmake project wiring for the shared-module layout and refresh the branch README to describe the split service model
- keep the notification schedule at the master value instead of carrying the temporary timing tweak

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