Analytics: include LinkedIn (pages now, personal profile after r_member_postAnalytics)

[paulocastellano]

LinkedIn and LinkedIn Pages are excluded from Analytics on purpose (Platform::isIncludedInAnalytics(), app/Enums/SocialAccount/Platform.php:43-50), so no publications, follower snapshots or post metrics are collected for them, and imported LinkedIn posts don't show up in Sent.

Target card (per post): reactions, comments, engagement rate, impressions, reach (+ reposts and clicks where available).

• LinkedIn Pages: use organizationalEntityShareStatistics (impressionCount, uniqueImpressionsCount → reach, clickCount, likeCount, commentCount, shareCount, engagement). The current page scopes should be enough — confirm against config('trypost.platforms.linkedin-page.scopes').
• Personal profile: Member Post Analytics API (memberCreatorPostAnalytics: IMPRESSION, MEMBERS_REACHED, REACTION, COMMENT, RESHARE) needs r_member_postAnalytics from the Community Management API product. Request access on the LinkedIn app first; add the scope to config('trypost.platforms.linkedin.scopes') only after it is approved (an unapproved scope breaks the consent screen for every connect/reconnect). Existing accounts must reconnect to grant it.
• Enable LinkedIn / LinkedInPage in isIncludedInAnalytics(), implement discovery + metrics in LinkedInAnalytics / LinkedInPageAnalytics, and add the per-network metric set in resources/js publicationMetrics.ts.
• Tests with Http::fake (official payloads), PostgreSQL + MySQL.

Docs: https://learn.microsoft.com/en-us/linkedin/marketing/community-management/shares/posts-api