docs: add MIT License and update footer

Author: yanglbme

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024-2026 doocs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/components/Footer.astro

@@ -1,6 +1,9 @@
 <footer class="border-t border-border mt-auto">
   <div class="max-w-[1100px] mx-auto px-4 sm:px-6 py-6 sm:py-8 text-center text-xs sm:text-sm text-text-muted">
-    <p>Copyright &copy; <span id="footer-year"></span> <a href="https://github.com/doocs" class="text-accent-light no-underline hover:underline" target="_blank" rel="noopener">Doocs</a></p>
+    <p>
+      Copyright &copy; <span id="footer-year"></span> <a href="https://github.com/doocs" class="text-accent-light no-underline hover:underline" target="_blank" rel="noopener">Doocs</a>
+      · Licensed under <a href="/LICENSE" class="text-accent-light no-underline hover:underline" target="_blank">MIT License</a>
+    </p>
   </div>
 </footer>
 <script>