feat(API-11): Route API calls through AgilitonAPI gateway

Add gateway-first pattern: when AGILITON_API_KEY is set, route all
external API calls through the gateway with X-API-Key auth. Falls back
to direct API access when gateway is unavailable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/mime-db/package.json

@@ -0,0 +1,56 @@
+{
+  "name": "mime-db",
+  "description": "Media Type Database",
+  "version": "1.54.0",
+  "contributors": [
+    "Douglas Christopher Wilson <doug@somethingdoug.com>",
+    "Jonathan Ong <me@jongleberry.com> (http://jongleberry.com)",
+    "Robert Kieffer <robert@broofa.com> (http://github.com/broofa)"
+  ],
+  "license": "MIT",
+  "keywords": [
+    "mime",
+    "db",
+    "type",
+    "types",
+    "database",
+    "charset",
+    "charsets"
+  ],
+  "repository": "jshttp/mime-db",
+  "devDependencies": {
+    "csv-parse": "4.16.3",
+    "eslint": "8.32.0",
+    "eslint-config-standard": "15.0.1",
+    "eslint-plugin-import": "2.27.5",
+    "eslint-plugin-markdown": "3.0.0",
+    "eslint-plugin-node": "11.1.0",
+    "eslint-plugin-promise": "6.1.1",
+    "eslint-plugin-standard": "4.1.0",
+    "media-typer": "1.1.0",
+    "mocha": "10.2.0",
+    "nyc": "15.1.0",
+    "stream-to-array": "2.3.0",
+    "undici": "7.1.0"
+  },
+  "files": [
+    "HISTORY.md",
+    "LICENSE",
+    "README.md",
+    "db.json",
+    "index.js"
+  ],
+  "engines": {
+    "node": ">= 0.6"
+  },
+  "scripts": {
+    "build": "node scripts/build",
+    "fetch": "node scripts/fetch-apache && node scripts/fetch-iana && node scripts/fetch-nginx",
+    "lint": "eslint .",
+    "test": "mocha --reporter spec --check-leaks test/",
+    "test-ci": "nyc --reporter=lcovonly --reporter=text npm test",
+    "test-cov": "nyc --reporter=html --reporter=text npm test",
+    "update": "npm run fetch && npm run build",
+    "version": "node scripts/version-history.js && git add HISTORY.md"
+  }
+}