feat: Add YouTube Chrome extension and GDM API - Chrome extension with popup UI, quality selection, server config - YouTube API endpoints: youtube_add, youtube_formats - Background worker with context menu integration - Content script with inline download button

chrome_extension/manifest.json

@@ -0,0 +1,39 @@
+{
+  "manifest_version": 3,
+  "name": "GDM YouTube Downloader",
+  "version": "1.0.0",
+  "description": "YouTube 영상을 GDM(gommi_downloader_manager)으로 전송하여 다운로드",
+  "permissions": [
+    "activeTab",
+    "storage"
+  ],
+  "host_permissions": [
+    "https://www.youtube.com/*",
+    "https://youtu.be/*",
+    "http://localhost:*/*",
+    "http://127.0.0.1:*/*"
+  ],
+  "action": {
+    "default_popup": "popup.html",
+    "default_icon": {
+      "16": "icons/icon16.png",
+      "48": "icons/icon48.png",
+      "128": "icons/icon128.png"
+    }
+  },
+  "icons": {
+    "16": "icons/icon16.png",
+    "48": "icons/icon48.png",
+    "128": "icons/icon128.png"
+  },
+  "background": {
+    "service_worker": "background.js"
+  },
+  "content_scripts": [
+    {
+      "matches": ["https://www.youtube.com/*"],
+      "js": ["content.js"],
+      "css": ["content.css"]
+    }
+  ]
+}