add: Megalodon, initial mastodon api

packages/backend/package.json

@@ -99,6 +99,7 @@
 		"date-fns": "2.30.0",
 		"deep-email-validator": "0.1.21",
 		"fastify": "4.23.2",
+		"fastify-multer": "^2.0.3",
 		"feed": "4.2.2",
 		"file-type": "18.5.0",
 		"fluent-ffmpeg": "2.1.2",
@@ -116,6 +117,7 @@
 		"json5": "2.2.3",
 		"jsonld": "8.3.1",
 		"jsrsasign": "10.8.6",
+		"megalodon": "workspace:*",
 		"meilisearch": "0.34.2",
 		"mfm-js": "0.23.3",
 		"microformats-parser": "1.5.2",