* Enhance IP data fetching * Code refactoring

### New Features * **HTTP Latency Test:** Added a feature to test the HTTP latency to the displayed IP/domain. * Includes a button in the popup to initiate the test. * Performs 10 sequential HEAD requests (HTTPS, using domain name for accuracy, with fallback to HTTP for IPs if needed). * Displays Minimum, Maximum, and Average latency for successful attempts. * Shows a real-time line graph visualizing the latency of each attempt using Chart.js. * Handles timeouts and network/CORS errors gracefully. * **Full Internationalization (i18n) Support:** * Implemented standard i18n structure using `_locales/` and `messages.json`. * Added support for English (default), Spanish, French, German, Dutch, Portuguese, Italian, Greek, Turkish, Japanese, and Russian. (Note: Translations other than English, Spanish, and French require completion). * All user-visible text in the popup is now localized. ### Bug Fixes * **Correct Geolocation:** Fixed an issue where the user's IP/location was sometimes shown instead of the visited domain's IP/location. The extension now correctly resolves the domain's IPv4 address (when possible) and uses it for geolocation lookups via the worker. * **Safari Crashes:** Resolved intermittent crashes in Safari related to `browser.storage.local` operations by simplifying cache keys. * **Latency Test Errors:** Fixed `ReferenceError` issues (`timeoutId`, `target`, `Chart`, `ip`) that prevented the latency test from running or displaying the chart correctly. Fixed issues related to certificate errors by using the domain name for HTTPS requests. * **UI Glitches:** * Fixed duplicate/missing "Test Latency" button. * Corrected popup layout on iOS to ensure it's centered and occupies the available width (removed body padding). * Ensured the popup content height adjusts dynamically when latency results are shown. * Fixed localization issues where some text remained in English instead of the detected browser language (Spanish). * Removed the redundant list display of individual ping results. ### Improvements & Refactoring * **Code Modularity:** Refactored `background.js` into smaller, more focused modules (`geoService.js`, `iconUpdater.js`) for better maintainability. * **IP Resolution:** Simplified IP resolution logic, relying on client-side DoH for IPv4 and the worker/API for domain-based lookups or fallbacks. * **Error Handling:** Improved error handling for API calls and latency tests, providing more specific feedback to the user. * **Performance:** Optimized popup loading by displaying cached data immediately while fetching fresh data in the background. * **Code Cleanup:** Removed unnecessary `console.log` statements. * **UI/UX:** * Relocated the "Test Latency" button for better layout. * Integrated the latency results section seamlessly within the main info card. * Refined the appearance of the latency chart with gradient fill and improved styling. * Removed unnecessary borders for a cleaner look.