add napi binding package for GitHub Packages publishing

Move the napi bridge from fire-pdf into pdf-inspector as `napi/`.
Package name: @firecrawl/pdf-inspector-js, published to GitHub Packages
(npm.pkg.github.com) as a public package on v* tags.

Exposes two functions:
- classifyPdf(buffer) → type, page count, pages needing OCR
- extractTextInRegions(buffer, pageRegions) → per-region text with
  needsOcr quality flag (GID fonts, garbage, encoding issues)

Includes publish workflow that builds linux-x64-gnu + darwin-arm64
binaries and publishes main + platform-specific packages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

napi/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@firecrawl/pdf-inspector-js",
+  "version": "0.2.0",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/firecrawl/pdf-inspector"
+  },
+  "publishConfig": {
+    "registry": "https://npm.pkg.github.com",
+    "access": "public"
+  },
+  "napi": {
+    "binaryName": "pdf-inspector",
+    "targets": [
+      "x86_64-unknown-linux-gnu",
+      "aarch64-apple-darwin"
+    ],
+    "package": {
+      "name": "@firecrawl/pdf-inspector-js"
+    }
+  },
+  "scripts": {
+    "build": "napi build --platform --release",
+    "build:debug": "napi build --platform",
+    "prepublishOnly": "napi prepublish -t npm",
+    "artifacts": "napi artifacts"
+  },
+  "devDependencies": {
+    "@napi-rs/cli": "^3.4.1"
+  }
+}