Consolidate the default scope set alongside the existing LinkedIn host
config under config/trypost.php -> platforms.linkedin, matching the
project convention that per-platform service config lives there. The
default still drops the deprecated r_basicprofile scope, and
LINKEDIN_EXTRA_SCOPES stays additive (merged onto the defaults rather
than replacing them) so operators can opt back into legacy scopes
without risking a misconfigured full-replacement.
- config/trypost.php: add scopes + extra_scopes to platforms.linkedin
- config/services.php: drop the moved extra_scopes key
- LinkedInController::resolveScopes(): read both from trypost config
- tests: repoint config() overrides to the new key
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