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.

domains_management.js

@@ -0,0 +1,39 @@
+document.addEventListener("DOMContentLoaded", function () {
+    const saveButton = document.getElementById("save");
+    const trustedInput = document.getElementById("trusted");
+    const blockedInput = document.getElementById("blocked");
+
+    // Load saved domains
+    chrome.storage.local.get(["trustedDomains", "blockedDomains"], function (data) {
+        if (data.trustedDomains) trustedInput.value = data.trustedDomains.join("\n");
+        if (data.blockedDomains) blockedInput.value = data.blockedDomains.join("\n");
+    });
+
+    // Save button event
+    saveButton.addEventListener("click", function () {
+        // Retrieve domains from input fields
+        const trustedDomains = trustedInput.value.split("\n").map(d => d.trim()).filter(d => d);
+        const blockedDomains = blockedInput.value.split("\n").map(d => d.trim()).filter(d => d);
+
+        // Save to Chrome storage
+        chrome.storage.local.set({ trustedDomains, blockedDomains }, function () {
+            showPopup("✅ Changes saved successfully!");
+        });
+    });
+
+    // Function to show styled popup message
+    function showPopup(message) {
+        const popup = document.getElementById("popupMessage");
+        const popupText = document.getElementById("popupText");
+        const popupClose = document.getElementById("popupClose");
+
+        popupText.innerText = message;
+        popup.classList.remove("hidden");
+        popup.classList.add("visible");
+
+        popupClose.addEventListener("click", function () {
+            popup.classList.remove("visible");
+            popup.classList.add("hidden");
+        });
+    }
+});