feat(web): add config CRUD API routes

web/server/routes/configs.ts

@@ -0,0 +1,26 @@
+import { Router } from 'express';
+import { randomUUID } from 'crypto';
+import { getDb } from '../db';
+
+export const configsRouter = Router();
+
+configsRouter.get('/', (_req, res) => {
+  const rows = getDb().prepare('SELECT * FROM configs ORDER BY key').all();
+  res.json(rows);
+});
+
+configsRouter.get('/:key', (req, res) => {
+  const row = getDb().prepare('SELECT * FROM configs WHERE key = ?').get(req.params.key);
+  if (!row) return res.status(404).json({ error: 'Config not found' });
+  res.json(row);
+});
+
+configsRouter.put('/:key', (req, res) => {
+  const { value } = req.body;
+  getDb().prepare(`
+    INSERT INTO configs (id, key, value, updated_at)
+    VALUES (?, ?, ?, datetime('now'))
+    ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = excluded.updated_at
+  `).run(randomUUID(), req.params.key, JSON.stringify(value));
+  res.json({ key: req.params.key, ok: true });
+});