Refactor Dewar service methods and improve field handling

Updated Dewar API methods to use protected endpoints for enhanced security and consistency. Added `pgroups` handling in various frontend components and modified the LogisticsView contact field for clarity. Simplified backend router imports for better readability.

backend/app/routers/sample.py

@@ -111,7 +111,7 @@ async def upload_sample_images(
         raise HTTPException(status_code=404, detail="Sample not found")
 
     # 2. Define Directory Structure
-    username = "e16371"  # Hardcoded username; replace with dynamic logic if applicable
+    pgroup = sample.puck.dewar.pgroups
     today = datetime.now().strftime("%Y-%m-%d")
     dewar_name = (
         sample.puck.dewar.dewar_name
@@ -120,7 +120,7 @@ async def upload_sample_images(
     )
     puck_name = sample.puck.puck_name if sample.puck else "default_puck"
     position = sample.position if sample.position else "default_position"
-    base_dir = Path(f"images/{username}/{today}/{dewar_name}/{puck_name}/{position}")
+    base_dir = Path(f"images/{pgroup}/{today}/{dewar_name}/{puck_name}/{position}")
     base_dir.mkdir(parents=True, exist_ok=True)
 
     # 3. Process and Save Each File