chore: add branding elements

README.md

@@ -1,6 +1,6 @@
-# AlienCommons
-
-> The common planet for all Minecraft players — a community platform for publishing, discussion, and discovery.
+<p align="center">
+  <img src=".github/assets/logo-lockup.png" width="720" alt="AlienCommons logo">
+</p>
 
 [![License](https://img.shields.io/badge/License-MIT-yellow?style=flat-square)](LICENSE)
 [![Python](https://img.shields.io/badge/Python-3.14-3776AB?style=flat-square&logo=python)](https://python.org)

README.zh.md

@@ -1,6 +1,6 @@
-# AlienCommons
-
-> 每个 TechMC 玩家的共享空间 —— 集发布、讨论、发现于一体的全栈社区平台。
+<p align="center">
+  <img src=".github/assets/logo-lockup.png" width="720" alt="AlienCommons 标志">
+</p>
 
 [![License](https://img.shields.io/badge/License-MIT-yellow?style=flat-square)](LICENSE)
 [![Python](https://img.shields.io/badge/Python-3.14-3776AB?style=flat-square&logo=python)](https://python.org)

branding/LICENSE

@@ -0,0 +1,29 @@
+AlienCommons Brand Assets License
+
+Copyright (c) 2025-2026 Lazy Alien Server. All rights reserved.
+
+The AlienCommons name, logo mark, wordmark, logo lockups, social-preview images,
+and other visual branding assets contained in this directory or in
+`.github/assets/` are not licensed under the MIT License that applies to the
+repository's source code.
+
+Permission is granted to copy and display these assets, without modification,
+for the following purposes:
+
+1. as part of a copy or fork of the AlienCommons repository;
+2. to link to or factually refer to the AlienCommons project; and
+3. in news, commentary, documentation, or community discussion about
+   AlienCommons.
+
+No permission is granted to:
+
+1. use the assets, or confusingly similar assets, as the branding of another
+   product, service, project, or organization;
+2. imply sponsorship, endorsement, or affiliation with AlienCommons or Lazy
+   Alien Server;
+3. modify or redistribute the assets as a standalone branding package; or
+4. use the assets on merchandise or in commercial promotion without prior
+   written permission from Lazy Alien Server.
+
+No trademark rights are granted under this license. All uses must comply with
+applicable law and must not damage or misrepresent the AlienCommons brand.

branding/README.md

@@ -0,0 +1,56 @@
+# AlienCommons branding
+
+This directory contains the source and canonical exports for the AlienCommons
+brand mark. Product code should consume copies generated from these files rather
+than treating an application-specific asset as the design source.
+
+## Structure
+
+```text
+branding/
+├── source/
+│   └── logo.aseprite          Editable 32 × 32 pixel-art source
+├── logo-mark.svg              Canonical scalable logo mark
+├── logo-mark-32.png           Native-size raster export
+├── logo-mark-64.png           2× raster export
+├── logo-mark-128.png          4× raster export
+├── logo-mark-256.png          8× raster export
+├── logo-mark-512.png          16× raster export
+└── web/
+    ├── favicon.svg
+    ├── favicon.ico
+    ├── favicon-16.png
+    ├── favicon-32.png
+    ├── favicon-48.png
+    ├── apple-touch-icon.png
+    └── pwa/
+        ├── icon-192.png
+        ├── icon-512.png
+        ├── icon-maskable-192.png
+        └── icon-maskable-512.png
+```
+
+GitHub-specific presentation assets live separately in `.github/assets/`.
+`logo-lockup.png` is a compact 1280 × 448 horizontal brand card combining the
+logo mark with an Alegreya Medium wordmark. It is used at the beginning of the
+repository READMEs. `social-preview.png` preserves the 1280 × 640 (2:1) layout
+for use as the repository social preview on GitHub.
+
+Brand assets are covered by the separate terms in [`LICENSE`](LICENSE), not by
+the repository's MIT License.
+
+## Export rules
+
+- Treat `source/logo.aseprite` as the editable source of truth for the logo mark.
+- Keep the native artwork on its 32 × 32 pixel grid.
+- Scale raster exports by integer multiples with nearest-neighbour sampling.
+- Keep `logo-mark.svg` transparent and preserve crisp pixel edges.
+- Regenerate web icons from the canonical mark instead of editing them independently.
+- Use `#4B3832` as the established solid brand background where one is required.
+
+## Terminology
+
+- **Logo mark**: the standalone book-and-laurel symbol.
+- **Wordmark**: the typeset `AlienCommons` name.
+- **Logo lockup**: the logo mark and wordmark arranged as one composition.
+- **Social preview**: a fixed-size presentation image used when sharing a link.