fix(sequences): coerce NUMERIC frame_rate to float in all API responses

node-postgres returns NUMERIC columns as strings by default.  Add a
mapSeq() helper that parses frame_rate to a JS float before any response
is sent.  Affected routes: GET /, POST /, PUT /:id, GET /:id.

services/mam-api/src/routes/sequences.js

@@ -7,6 +7,15 @@ import { requireAuth } from '../middleware/auth.js';
 const router = express.Router();
 router.use(requireAuth);
 
+// ── Row mapper ────────────────────────────────────────────────────────────────
+// node-postgres returns NUMERIC columns as strings.  Coerce frame_rate to a
+// JS float before sending any sequence object to clients.
+
+function mapSeq(row) {
+  if (!row) return row;
+  return { ...row, frame_rate: parseFloat(row.frame_rate) || 59.94 };
+}
+
 // ── Timecode helpers ──────────────────────────────────────────────────────────
 //
 // generateEDL emits CMX3600 timecode using the sequence's frame_rate.
@@ -19,7 +28,7 @@ router.use(requireAuth);
 function pad2(n) { return String(Math.floor(n)).padStart(2, '0'); }
 
 function framesToTC(totalFrames, fps) {
-  fps = fps || 59.94;
+  fps = parseFloat(fps) || 59.94;
   const fc = Math.max(0, Math.round(totalFrames));
 
   // 29.97 DF ─ drop 2 frames per minute except every 10th
@@ -77,7 +86,7 @@ function framesToTC(totalFrames, fps) {
 }
 
 function generateEDL(seqName, clips, fps) {
-  fps = fps || 59.94;
+  fps = parseFloat(fps) || 59.94;
   const lines = [`TITLE: ${seqName}`, ''];
   clips.forEach((c, i) => {
     const num    = String(i + 1).padStart(3, '0');
@@ -105,7 +114,7 @@ router.get('/', async (req, res, next) => {
       `SELECT * FROM sequences WHERE project_id = $1 ORDER BY updated_at DESC`,
       [project_id]
     );
-    res.json(r.rows);
+    res.json(r.rows.map(mapSeq));
   } catch (e) { next(e); }
 });
 
@@ -125,7 +134,7 @@ router.post('/', async (req, res, next) => {
        VALUES ($1, $2, $3, $4, $5) RETURNING *`,
       [project_id, name, frame_rate, width, height]
     );
-    res.status(201).json(r.rows[0]);
+    res.status(201).json(mapSeq(r.rows[0]));
   } catch (e) { next(e); }
 });
 
@@ -160,7 +169,7 @@ router.get('/:id', async (req, res, next) => {
       })
     );
 
-    res.json({ ...seqR.rows[0], clips });
+    res.json({ ...mapSeq(seqR.rows[0]), clips });
   } catch (e) { next(e); }
 });
 
@@ -183,7 +192,7 @@ router.put('/:id', async (req, res, next) => {
       params
     );
     if (!r.rows.length) return res.status(404).json({ error: 'Sequence not found' });
-    res.json(r.rows[0]);
+    res.json(mapSeq(r.rows[0]));
   } catch (e) { next(e); }
 });
 
@@ -254,7 +263,7 @@ router.post('/:id/export/edl', async (req, res, next) => {
   try {
     const seqR = await pool.query(`SELECT * FROM sequences WHERE id = $1`, [req.params.id]);
     if (!seqR.rows.length) return res.status(404).json({ error: 'Sequence not found' });
-    const seq = seqR.rows[0];
+    const seq = mapSeq(seqR.rows[0]);
 
     // Export V1 clips only (primary video track) sorted by position
     const clipsR = await pool.query(