chore: improve postal data import observability

Add progress logging and a status script for postal imports and neighbor builds, and ignore local raw and generated postal datasets.

package-lock.json

@@ -23,6 +23,7 @@
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         "react": "^19.0.0",
         "react-dom": "^19.0.0",
+        "stream-json": "^2.1.0",
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         "vite": "^6.2.0",
         "zod": "^4.3.6"
@@ -3225,6 +3226,27 @@
         "node": ">= 10.x"
       }
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+      "resolved": "https://registry.npmjs.org/stream-chain/-/stream-chain-3.6.1.tgz",
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+      "license": "BSD-3-Clause",
+      "funding": {
+        "url": "https://github.com/sponsors/uhop"
+      }
+    },
+    "node_modules/stream-json": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/stream-json/-/stream-json-2.1.0.tgz",
+      "integrity": "sha512-9gV/ywtebMn3DdKnNKYCb9iESvgR1dHbucNV+bRGvdvy+jV4c9FFgYKmENhpKv58jSwvs90Wk80RhfKk1KxHPg==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "stream-chain": "^3.6.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/uhop"
+      }
+    },
     "node_modules/tagged-tag": {
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