feat(05-02): exa-search research integration

backend/src/index.js

@@ -3,6 +3,8 @@ const cors = require('cors');
 const { Pool } = require('pg');
 const bcrypt = require('bcryptjs');
 const jwt = require('jsonwebtoken');
+const { createExerciseResearchRouter } = require('./routes/exerciseResearch');
+const { searchExerciseResearch } = require('./services/exaSearch');
 
 const app = express();
 const PORT = process.env.PORT || 3001;
@@ -18,6 +20,7 @@ const pool = new Pool({
 
 app.use(cors());
 app.use(express.json());
+app.use('/api/exercises', createExerciseResearchRouter({ pool, exaSearch: searchExerciseResearch }));
 
 const authMiddleware = (req, res, next) => {
   const token = req.headers.authorization?.split(' ')[1];
@@ -394,9 +397,11 @@ app.get('/api/today/:programId', async (req, res) => {
   }
 });
 
-app.listen(PORT, '0.0.0.0', () => {
-  console.log(`Gravl API running on port ${PORT}`);
-});
+if (require.main === module) {
+  app.listen(PORT, '0.0.0.0', () => {
+    console.log(`Gravl API running on port ${PORT}`);
+  });
+}
 
 // ============================================
 // Custom Workouts API (Phase 4: Workout Modification)
@@ -764,3 +769,4 @@ app.delete('/api/logs', async (req, res) => {
   }
 });
 
+module.exports = app;