feat(frontend): Update footer with version info and attribution

- Display app version dynamically from window._env_.APP_VERSION
- Credit original author (vallezw) with link to original repo
- Credit extended version (lotzm) with link to Gitea repo
- Update package.json version to 1.1.0

Footer styling:
- Position fixed at bottom-right corner of viewport
- Unobtrusive design with small font size (11px)
- Semi-transparent background with subtle shadow
- Stays visible while scrolling
- Hover effect on links for better UX

Changes:
- frontend/package.json: version 0.1.0 → 1.1.0
- Footer.js: Dynamic version display, attribution links
- Footer.css: Fixed positioning, responsive styling

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "frontend",
-  "version": "0.1.0",
+  "version": "1.1.0",
   "private": true,
   "dependencies": {
     "@dnd-kit/core": "^6.3.1",

frontend/src/Components/ComponentUtils/Css/Footer.css

@@ -1,25 +1,35 @@
 
 .copyright {
-    text-align:center;
-    font-size:13px;
-    color:#aaa;
-    font-family: "Roboto";
+    text-align: right;
+    font-size: 11px;
+    color: #808080;
+    font-family: "Roboto", sans-serif;
     font-weight: lighter;
+    margin: 0;
+    padding-right: 20px;
 }
 
 footer {
-    position: absolute;
+    position: fixed;
     bottom: 0;
-    width: 99%;
-    height: 2.5rem;  
+    right: 0;
+    padding: 10px;
+    background: rgba(255, 255, 255, 0.95);
+    border-top-left-radius: 8px;
+    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
+    z-index: 100;
 }
 
-a {
-    text-align:center;
-    font-size:13px;
-    color:#aaa;
-    font-family: "Roboto";
+footer a {
+    font-size: 11px;
+    color: #777;
+    font-family: "Roboto", sans-serif;
     font-weight: lighter;
     text-decoration: none;
-    
+    transition: color 0.2s ease;
+}
+
+footer a:hover {
+    color: #333;
+    text-decoration: underline;
 }

frontend/src/Components/ComponentUtils/Footer.js

@@ -3,9 +3,17 @@ import React from 'react'
 import './Css/Footer.css'
 
 function Footer() {
+    const version = window._env_?.APP_VERSION || '1.1.0';
+    
     return (
         <footer>
-            {/*<p className="copyright">Made by <a href="https://github.com/vallezw" target="_blank">Valentin Zwerschke</a> | <a href="https://github.com/vallezw/Image-Uploader" target="_blank" >vallezw/Image-Uploader</a></p>*/}
+            <p className="copyright">
+                Based on <a href="https://github.com/vallezw/Image-Uploader" target="_blank" rel="noopener noreferrer">Image-Uploader by vallezw</a>
+                {' | '}
+                Extended by <a href="https://gitea.lan.hobbyhimmel.de/hobbyhimmel/Project-Image-Uploader" target="_blank" rel="noopener noreferrer">Hobbyhimmel</a>
+                {' | '}
+                v{version}
+            </p>
         </footer>
     )
 }