Add Skins format, GolfCourseAPI import, and UX improvements

- Add Skins game format with optional carryover, mirroring BBB scoring pattern
- Add GolfCourseAPI integration for course search and import (httpx)
- Unwrap {"course": {}} API response envelope on import
- Add searchable course combobox and player filter to new game form
- Redirect to summary page after finishing a game
- Fix auth to allow registered users without a pending invitation
- Fix hardcoded BBB format in create_game; store carryover flag in DB
- Add game summary/scorecard view for completed games
- Add live games social stream to dashboard
- Add course name + subtitle to recent game cards
- Reorder nav: Home → Games → Admin → Profile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/database.py

@@ -120,6 +120,7 @@ async def init_db():
             "ALTER TABLE games ADD COLUMN course_id TEXT REFERENCES courses(id)",
             "ALTER TABLE game_players ADD COLUMN tee_id TEXT REFERENCES course_tees(id)",
             "ALTER TABLE course_holes ADD COLUMN stroke_index INTEGER",
+            "ALTER TABLE games ADD COLUMN carryover INTEGER NOT NULL DEFAULT 1",
         ]:
             try:
                 await db.execute(migration)