feat(backend): settings, upload media, seed données démo

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/routers/media.py

@@ -1,2 +1,29 @@
-from fastapi import APIRouter
-router = APIRouter()
+import os
+import uuid
+from fastapi import APIRouter, File, HTTPException, UploadFile
+from app.config import UPLOAD_DIR
+
+router = APIRouter(tags=["media"])
+
+ALLOWED_EXT = {".jpg", ".jpeg", ".png", ".webp", ".gif"}
+
+
+@router.post("/upload")
+async def upload_file(file: UploadFile = File(...)):
+    ext = os.path.splitext(file.filename or "")[-1].lower()
+    if ext not in ALLOWED_EXT:
+        raise HTTPException(status_code=400, detail="Format non supporté")
+    filename = f"{uuid.uuid4().hex}{ext}"
+    dest = os.path.join(UPLOAD_DIR, filename)
+    os.makedirs(UPLOAD_DIR, exist_ok=True)
+    content = await file.read()
+    with open(dest, "wb") as f:
+        f.write(content)
+    return {"filename": filename, "url": f"/uploads/{filename}"}
+
+
+@router.delete("/upload/{filename}", status_code=204)
+def delete_file(filename: str):
+    path = os.path.join(UPLOAD_DIR, filename)
+    if os.path.exists(path):
+        os.remove(path)