fix: photos now display in History with token auth

Problem: Photo endpoint requires auth header, but <img src> can't send headers.

Solution:
- Backend: Added require_auth_flexible() that accepts token via header OR query param
- Backend: Photo endpoint uses flexible auth
- Frontend: photoUrl() now appends ?token=xxx to URL

Photos in History/Verlauf now display correctly.

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

backend/main.py

@@ -149,6 +149,12 @@ def require_auth(x_auth_token: Optional[str]=Header(default=None)):
     if not session: raise HTTPException(401, "Nicht eingeloggt")
     return session
 
+def require_auth_flexible(x_auth_token: Optional[str]=Header(default=None), token: Optional[str]=Query(default=None)):
+    """Auth via header OR query parameter (for <img> tags)."""
+    session = get_session(x_auth_token or token)
+    if not session: raise HTTPException(401, "Nicht eingeloggt")
+    return session
+
 def require_admin(x_auth_token: Optional[str]=Header(default=None)):
     session = get_session(x_auth_token)
     if not session: raise HTTPException(401, "Nicht eingeloggt")
@@ -500,13 +506,17 @@ async def upload_photo(file: UploadFile=File(...), date: str="",
     return {"id":fid,"date":date}
 
 @app.get("/api/photos/{fid}")
-def get_photo(fid: str, session: dict=Depends(require_auth)):
+def get_photo(fid: str, session: dict=Depends(require_auth_flexible)):
+    """Get photo by ID. Auth via header or query param (for <img> tags)."""
     with get_db() as conn:
         cur = get_cursor(conn)
         cur.execute("SELECT path FROM photos WHERE id=%s", (fid,))
         row = cur.fetchone()
-        if not row: raise HTTPException(404)
-        return FileResponse(row['path'])
+        if not row: raise HTTPException(404, "Photo not found")
+        photo_path = Path(PHOTOS_DIR) / row['path']
+        if not photo_path.exists():
+            raise HTTPException(404, "Photo file not found")
+        return FileResponse(photo_path)
 
 @app.get("/api/photos")
 def list_photos(x_profile_id: Optional[str]=Header(default=None), session: dict=Depends(require_auth)):

frontend/src/utils/api.js

@@ -68,7 +68,10 @@ export const api = {
     return fetch(`${BASE}/photos`,{method:'POST',body:fd,headers:hdrs()}).then(r=>r.json())
   },
   listPhotos: ()         => req('/photos'),
-  photoUrl:   (pid)      => `${BASE}/photos/${pid}`,
+  photoUrl:   (pid)      => {
+    const token = getToken()
+    return `${BASE}/photos/${pid}${token ? `?token=${token}` : ''}`
+  },
 
   // Nutrition
   importCsv: async(file)=>{