feat(heal): add server-side AI inpainting endpoint via ONNX Runtime

docker/backend/src/server.ts

@@ -1,3 +1,4 @@
+import { runServerInpaint } from './inpaintService';
 import { recipeFile } from './recipeFile';
 import { sendVerificationMail } from './mailer';
 import { placeName } from './place';
@@ -425,6 +426,43 @@ async function lookupGeo(ip: string): Promise<GeoPlace | null> {
 // ---- routes ----
 app.get('/api/health', async () => ({ ok: true }));
 
+// AI Inpainting endpoint (Hybrid Option 2)
+app.post('/api/inpaint', { bodyLimit: 10 * 1024 * 1024 }, async (req, reply) => {
+  const b = bodyOf(req) as {
+    src?: string;
+    mask?: string;
+    w?: number;
+    h?: number;
+  };
+  if (!b || !b.src || !b.mask || typeof b.w !== 'number' || typeof b.h !== 'number') {
+    return reply.status(400).send({ ok: false, error: 'Missing src, mask, w, or h' });
+  }
+
+  const { w, h } = b;
+  const srcBuf = Buffer.from(b.src, 'base64');
+  const maskBuf = Buffer.from(b.mask, 'base64');
+
+  if (srcBuf.length !== 3 * w * h || maskBuf.length !== w * h) {
+    return reply.status(400).send({ ok: false, error: 'Dimension mismatch' });
+  }
+
+  try {
+    const patch = await runServerInpaint(new Uint8Array(srcBuf), new Uint8Array(maskBuf), w, h);
+    if (!patch) {
+      return reply.status(503).send({ ok: false, error: 'Inpaint model unavailable' });
+    }
+    return reply.send({
+      ok: true,
+      patch: Buffer.from(patch).toString('base64'),
+      w,
+      h,
+    });
+  } catch (err: any) {
+    req.log.error(err, 'Inpaint inference error');
+    return reply.status(500).send({ ok: false, error: String(err?.message || err) });
+  }
+});
+
 // Native file manager launcher (Open in window explorer)
 app.post('/api/open-explorer', async (req, reply) => {
   const b = bodyOf(req);