Adds seed_cockpit_demo.py script to populate the cockpit database with representative forward track data (4 strategies), nav histories, backtest summaries, and allocation/funding snapshots. Idempotent — safe to re-run multiple times. Supports env override FXHNT_OPERATIONAL_DSN (defaults to sqlite:///./cockpit-demo.db). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>