feat: initial Jimi Gallery prototype

- Public site (Home/Artists/Exhibitions/News/About/Contact) with EN/KO/JA i18n
- Admin panel with login, CRUD, image upload, multilingual editing
- Exhibition slider/lightbox view
- FastAPI + MongoDB backend, JWT auth
- Docker Compose deployment, behind nginx at jimi.yakenator.io

assets/logo.svg

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100" role="img" aria-label="Jimi Gallery">
+  <title>Jimi Gallery</title>
+  <circle cx="50" cy="50" r="50" fill="#6b3d8f"/>
+  <g fill="#ffffff" font-family="'Cormorant Garamond','Playfair Display','Times New Roman',serif" font-weight="500" font-style="italic">
+    <text x="37" y="70" text-anchor="middle" font-size="60">J</text>
+    <text x="63" y="70" text-anchor="middle" font-size="60">M</text>
+  </g>
+</svg>