fix: stop .gitignore from excluding build/.next (site 502/blank after deploy)

.gitignore's ".next/" rule (no leading slash) matched at any depth, so
build/.next was silently excluded from every commit even though build.sh
populates it. The Docker image was built without the compiled server/static
output, so server.js had nothing to serve. Anchor the rule to the repo root
and commit the compiled output that Dokploy actually needs.

build/.next/server/app/miletruth/page/react-loadable-manifest.json

@@ -0,0 +1,26 @@
+{
+  "29539": {
+    "id": 29539,
+    "files": [
+      "static/chunks/0ckcqe5on274m.js",
+      "static/chunks/04uib0xi8_zof.js",
+      "static/chunks/0e.~6vil2~4uy.js"
+    ]
+  },
+  "39184": {
+    "id": 39184,
+    "files": [
+      "static/chunks/15p8tu-h65hwr.js",
+      "static/chunks/0-kxqnmnjtk7l.js",
+      "static/chunks/04uib0xi8_zof.js",
+      "static/chunks/0e.~6vil2~4uy.js"
+    ]
+  },
+  "55819": {
+    "id": 55819,
+    "files": [
+      "static/chunks/0yqyiard9rg2e.js",
+      "static/chunks/0d09zs~9jbu5_.js"
+    ]
+  }
+}