feat: Feature 2.2 — Line Movement + Cascade Detection

Line movement system:
- Baseline capture on first odds fetch of the day
- Movement detection >= 0.5 points with direction (up/down)
- Sharp money heuristic (sharp_action/public_action/unknown)
- GET /api/movements with player, stat_type, min_movement filters
- Movements included in GET /api/odds/nba live responses

Cascade detection system:
- Scratch detection: player props disappear from 2+ books
- Affected user lookup via scan_sessions + picks
- Parlay re-grade without scratched legs
- cascade_alerts created for affected users
- GET /api/alerts (Analyst/Desk only), PATCH /api/alerts/:id/read

Zero extra Odds API credits — all detection piggybacks on existing fetches.
Migration 002: line_baselines, line_movements, cascade_alerts tables.

30 new tests, 188 total (161 Node.js + 27 Python), all passing.
Phase 2 Core Product COMPLETE.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app.js

@@ -3,11 +3,15 @@ const express = require('express');
 const oddsRoutes = require('./routes/odds');
 const analyzeRoutes = require('./routes/analyze');
 const scanRoutes = require('./routes/scan');
+const movementsRoutes = require('./routes/movements');
+const alertsRoutes = require('./routes/alerts');
 
 const app = express();
 app.use(express.json());
 app.use('/api/odds', oddsRoutes);
 app.use('/api/analyze', analyzeRoutes);
 app.use('/api/scan', scanRoutes);
+app.use('/api/movements', movementsRoutes);
+app.use('/api/alerts', alertsRoutes);
 
 module.exports = app;