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>

backend/src/routes/analytics-v2.ts

@@ -16,6 +16,7 @@ import { BrandPenetrationService } from '../services/analytics/BrandPenetrationS
 import { CategoryAnalyticsService } from '../services/analytics/CategoryAnalyticsService';
 import { StoreAnalyticsService } from '../services/analytics/StoreAnalyticsService';
 import { StateAnalyticsService } from '../services/analytics/StateAnalyticsService';
+import { BrandIntelligenceService } from '../services/analytics/BrandIntelligenceService';
 import { TimeWindow, LegalType } from '../services/analytics/types';
 
 function parseTimeWindow(window?: string): TimeWindow {
@@ -41,6 +42,7 @@ export function createAnalyticsV2Router(pool: Pool): Router {
   const categoryService = new CategoryAnalyticsService(pool);
   const storeService = new StoreAnalyticsService(pool);
   const stateService = new StateAnalyticsService(pool);
+  const brandIntelligenceService = new BrandIntelligenceService(pool);
 
   // ============================================================
   // PRICE ANALYTICS
@@ -259,6 +261,48 @@ export function createAnalyticsV2Router(pool: Pool): Router {
     }
   });
 
+  /**
+   * GET /brand/:name/intelligence
+   * Get comprehensive B2B brand intelligence dashboard data
+   *
+   * Returns all brand metrics in a single unified response:
+   *   - Performance Snapshot (active SKUs, revenue, stores, market share)
+   *   - Alerts/Slippage (lost stores, delisted SKUs, competitor takeovers)
+   *   - Product Velocity (daily rates, velocity status)
+   *   - Retail Footprint (penetration, whitespace opportunities)
+   *   - Competitive Landscape (price position, market share trend)
+   *   - Inventory Health (days of stock, risk levels)
+   *   - Promotion Effectiveness (baseline vs promo velocity, ROI)
+   *
+   * Query params:
+   *   - window: 7d|30d|90d (default: 30d)
+   *   - state: state code filter (e.g., AZ)
+   *   - category: category filter (e.g., Flower)
+   */
+  router.get('/brand/:name/intelligence', async (req: Request, res: Response) => {
+    try {
+      const brandName = decodeURIComponent(req.params.name);
+      const window = parseTimeWindow(req.query.window as string);
+      const stateCode = req.query.state as string | undefined;
+      const category = req.query.category as string | undefined;
+
+      const result = await brandIntelligenceService.getBrandIntelligence(brandName, {
+        window,
+        stateCode,
+        category,
+      });
+
+      if (!result) {
+        return res.status(404).json({ error: 'Brand not found' });
+      }
+
+      res.json(result);
+    } catch (error) {
+      console.error('[AnalyticsV2] Brand intelligence error:', error);
+      res.status(500).json({ error: 'Failed to fetch brand intelligence' });
+    }
+  });
+
   // ============================================================
   // CATEGORY ANALYTICS
   // ============================================================