feat(analytics): Add Brand Intelligence API endpoint
New endpoint: GET /api/analytics/v2/brand/:name/intelligence
Returns comprehensive brand analytics payload including:
- Performance snapshot (active SKUs, revenue, stores, market share)
- Alerts (lost stores, delisted SKUs, competitor takeovers)
- SKU performance (velocity, status, stock levels)
- Retail footprint (penetration by region, whitespace opportunities)
- Competitive landscape (price positioning, head-to-head comparisons)
- Inventory health (days of stock, risk levels, overstock alerts)
- Promotion effectiveness (baseline vs promo velocity, lift, ROI)
Supports time windows (7d/30d/90d), state filtering, and category filtering.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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