feat: production-ready release v1.0.0

- Integrated 'Koala-Bridge' for seamless web-to-extension communication.
- Implemented dedicated, minimalist invitation page (join.html).
- Added brute-force protection and RAM-cleanup to the relay server.
- Removed external fonts and trackers from the landing page (Privacy First).
- Unified header/footer design across all website pages.
- Added MIT License and comprehensive legal documentation (Impressum/Datenschutz).

extension/bridge.js

@@ -0,0 +1,31 @@
+/**
+ * KoalaSync Bridge Script
+ * Injected into koalasync.shik3i.net to facilitate communication between 
+ * the landing page and the extension.
+ */
+
+// 1. Signal presence to the website
+document.documentElement.dataset.koalasyncInstalled = 'true';
+
+// 2. Listen for Join Requests from the Website
+window.addEventListener('KOALASYNC_JOIN_REQUEST', (e) => {
+    const { roomId, password } = e.detail;
+    chrome.runtime.sendMessage({ 
+        type: 'WEB_JOIN_REQUEST', 
+        roomId, 
+        password 
+    });
+});
+
+// 3. Listen for Status Updates from the Extension and relay to Website
+chrome.runtime.onMessage.addListener((msg) => {
+    if (msg.type === 'JOIN_STATUS') {
+        const event = new CustomEvent('KOALASYNC_STATUS', { 
+            detail: { 
+                success: msg.success, 
+                message: msg.message 
+            } 
+        });
+        window.dispatchEvent(event);
+    }
+});