fix(audio-processing): externalize FFmpeg to fix Docker build

Marks @ffmpeg/ffmpeg and @ffmpeg/util as external in tsup build
to prevent bundling browser-only code during Node.js builds.

This resolves "ffmpeg.wasm does not support nodejs" error during
Docker image builds.

Changes:
- Add --external flags to tsup build commands
- Reorder package.json exports (types first)

Author: KevenWMarkham

packages/audio-processing/package.json

@@ -7,18 +7,23 @@
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/index.mjs",
-      "require": "./dist/index.js",
-      "types": "./dist/index.d.ts"
+      "require": "./dist/index.js"
     }
   },
   "scripts": {
-    "build": "tsup src/index.ts --format cjs,esm --dts",
-    "dev": "tsup src/index.ts --format cjs,esm --dts --watch",
+    "build": "tsup src/index.ts --format cjs,esm --dts --external @ffmpeg/ffmpeg --external @ffmpeg/util",
+    "dev": "tsup src/index.ts --format cjs,esm --dts --watch --external @ffmpeg/ffmpeg --external @ffmpeg/util",
     "clean": "rm -rf dist",
     "type-check": "tsc --noEmit"
   },
-  "keywords": ["audio", "ffmpeg", "extraction", "processing"],
+  "keywords": [
+    "audio",
+    "ffmpeg",
+    "extraction",
+    "processing"
+  ],
   "author": "Keven Markham",
   "license": "ISC",
   "sideEffects": false,