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/air-freight/page/app-paths-manifest.json

@@ -0,0 +1,3 @@
+{
+  "/air-freight/page": "app/air-freight/page.js"
+}

build/.next/server/app/air-freight/page/build-manifest.json

@@ -0,0 +1,18 @@
+{
+  "devFiles": [],
+  "ampDevFiles": [],
+  "polyfillFiles": [
+    "static/chunks/03~yq9q893hmn.js"
+  ],
+  "lowPriorityFiles": [],
+  "rootMainFiles": [
+    "static/chunks/098a0lm-b~rn..js",
+    "static/chunks/0tldj~reb5~dn.js",
+    "static/chunks/110q6k5sdl4es.js",
+    "static/chunks/14_678uuyq.tf.js",
+    "static/chunks/07uz2g0_38qia.js",
+    "static/chunks/turbopack-11jn_eqn~72wc.js"
+  ],
+  "pages": {},
+  "ampFirstPages": []
+}

build/.next/server/app/air-freight/page/next-font-manifest.json

@@ -0,0 +1,14 @@
+{
+  "pages": {},
+  "app": {
+    "[project]/src/app/air-freight/page": [
+      "static/media/a343f882a40d2cc9-s.p.0kho-wj7-y-w1.woff2",
+      "static/media/0c89a48fa5027cee-s.p.0rd3rjvnnhw7n.woff2",
+      "static/media/0c795a286deabae8-s.p.14tvuu96~wkr0.woff2",
+      "static/media/5c285b27cdda1fe8-s.p.0yo6-5yoeeudq.woff2",
+      "static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2"
+    ]
+  },
+  "appUsingSizeAdjust": true,
+  "pagesUsingSizeAdjust": false
+}

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

@@ -0,0 +1 @@
+{}

build/.next/server/app/air-freight/page/server-reference-manifest.json

@@ -0,0 +1,17 @@
+{
+  "node": {
+    "40275f0c2193420edd4a0270f91d8fd12134ede38f": {
+      "workers": {
+        "app/air-freight/page": {
+          "moduleId": 67113,
+          "async": false,
+          "exportedName": "sendEmailAction",
+          "filename": "src/actions/sendEmail.ts"
+        }
+      },
+      "exportedName": "sendEmailAction",
+      "filename": "src/actions/sendEmail.ts"
+    }
+  },
+  "edge": {}
+}