feat: Add Enterprise App Protection extension with settings and popup UI

- Implement manifest.json for Chrome extension with necessary permissions and background scripts.
- Create options.html for user settings including Google Safe Browsing API key, domains database URL, update interval, and warning message template.
- Develop options.js to handle loading and saving settings using Chrome storage.
- Design popup.html to display suspicious links and provide options to update the database and manage domains.
- Implement popup.js to manage interactions in the popup, including updating the database and resetting the suspicious links counter.
- Add testsite.html for dynamic testing of the extension with both official and fake links.

manifest.json

@@ -0,0 +1,48 @@
+{
+  "manifest_version": 3,
+  "name": "Enterprise App Protection",
+  "version": "1.0",
+  "description": "Warns when enterprise tool mentions are linked to non-official sites",
+  "permissions": [
+    "storage",
+    "activeTab",
+    "alarms",
+    "scripting",
+    "tabs"
+  ],
+  "host_permissions": [
+    "https://raw.githubusercontent.com/*"
+  ],
+  "background": {
+    "service_worker": "background.js",
+    "type": "module"
+  },
+  "content_scripts": [
+    {
+      "matches": ["<all_urls>"],
+      "js": ["config.js", "content.js"],
+      "run_at": "document_idle"
+    }
+  ],
+  "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"
+  },
+  "options_page": "options.html",
+  "content_security_policy": {
+    "extension_pages": "script-src 'self'; object-src 'self'"
+  },
+  "web_accessible_resources": [{
+    "resources": ["icons/*"],
+    "matches": ["<all_urls>"]
+  }]
+}