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

backend/db.py

@@ -0,0 +1,24 @@
+"""Mongo connection and collection accessors."""
+import os
+
+from motor.motor_asyncio import AsyncIOMotorClient
+
+MONGO_URL = os.environ.get("MONGO_URL", "mongodb://localhost:27017")
+DB_NAME = os.environ.get("DB_NAME", "jimi_gallery")
+
+client = AsyncIOMotorClient(MONGO_URL)
+db = client[DB_NAME]
+
+artists = db.artists
+exhibitions = db.exhibitions
+news = db.news
+settings_col = db.settings  # single-document collection keyed by _id="singleton"
+
+
+def strip_id(doc):
+    """Drop Mongo's _id before returning to the client."""
+    if doc is None:
+        return None
+    doc = dict(doc)
+    doc.pop("_id", None)
+    return doc