POST /social/accounts/connect
{"platform": "twitter", "credentials": {"username": "@handle", "password": "..."}}

POST /social/posts                          # Create draft
POST /social/posts/{id}/publish             # Approve & publish
POST /social/posts/{id}/schedule            # Schedule for later
POST /social/posts/cross-post               # Post to multiple platforms
DELETE /social/posts/{id}                    # Delete draft

POST /social/calendar/generate
{"platform": "twitter", "start_date": "2026-06-20", "end_date": "2026-06-27", "posts_per_day": 2}

GET /social/calendar

GET /social/analytics/{post_id}