fix: BILINEAR+BaseException catch to fix image worker timeout in PDF/DOCX

Root cause was WORKER TIMEOUT, not OOM:
- Gunicorn sends SIGABRT to workers that exceed 60s timeout
- SIGABRT handler calls sys.exit(1) raising SystemExit(BaseException)
- except Exception does NOT catch SystemExit, so the worker crashes

Two fixes:
1. except BaseException — catches SystemExit so the worker survives
   and gracefully skips the image (returns None) instead of dying
2. Image.BILINEAR instead of LANCZOS — orders of magnitude faster
   for large images, ensures processing completes well within 60s
3. Reduce max_width 1600->800, megapixel limit 20->8 MP, optimize=True removed
   (these reduce processing time further)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/modules/fleet/views.py

@@ -464,32 +464,31 @@ def _resolve_service_report_tasks(work_order, task_id):
     return [selected_task], selected_task
 
 
-_COMPRESS_IMAGE_MAX_MEGAPIXELS = 20  # preskači slike iznad 20 MP kako bi se izbjegao OOM
+_COMPRESS_IMAGE_MAX_MEGAPIXELS = 8  # preskači slike iznad 8 MP; sprječava timeout i OOM
 
 
-def _compress_image_for_pdf(image_field, max_width=1280, quality=75):
+def _compress_image_for_pdf(image_field, max_width=800, quality=75):
     """
     Otvori image_field (Django FileField), kompresiraj na max_width JPEG u memoriji,
     vrati ImageReader spreman za reportlab. Vraća None ako slika nije dostupna.
 
-    Redoslijed thumbnail() → convert() je bitan: thumbnail() interno poziva draft()
-    za JPEG (smanjuje rezoluciju JPEG dekodera na serveru) te radi in-place resize
-    bez alokacije full-resolution kopije. convert() se poziva tek na već maloj slici.
-    Pixel-count guard preskači slike koje bi i uz draft() prekoračile RAM.
+    BILINEAR umjesto LANCZOS: višestruko brže za velike slike (izbjeći Gunicorn timeout).
+    Megapixel guard čita samo header i preskače slike > 8 MP bez dekodiranja piksela.
+    except BaseException hvata i SystemExit koji Gunicorn diže na SIGABRT (worker timeout).
     """
     try:
         image_field.open('rb')
         with Image.open(image_field) as img:
-            w, h = img.size  # čita samo header, bez dekodiranja piksela
+            w, h = img.size
             if w * h > _COMPRESS_IMAGE_MAX_MEGAPIXELS * 1_000_000:
                 return None
-            img.thumbnail((max_width, max_width * 4), Image.LANCZOS)
+            img.thumbnail((max_width, max_width * 2), Image.BILINEAR)
             rgb = img.convert('RGB')
             buf = BytesIO()
-            rgb.save(buf, format='JPEG', quality=quality, optimize=True)
+            rgb.save(buf, format='JPEG', quality=quality)
             buf.seek(0)
         return ImageReader(buf)
-    except Exception:
+    except BaseException:
         return None
     finally:
         try:
@@ -498,28 +497,27 @@ def _compress_image_for_pdf(image_field, max_width=1280, quality=75):
             pass
 
 
-def _compress_image_for_docx(image_field, max_width=1600, quality=80):
+def _compress_image_for_docx(image_field, max_width=800, quality=80):
     """
     Pripremi sliku za python-docx kao JPEG stream razumne veličine.
 
-    Redoslijed thumbnail() → convert() je bitan: thumbnail() interno poziva draft()
-    za JPEG (smanjuje rezoluciju JPEG dekodera na serveru) te radi in-place resize
-    bez alokacije full-resolution kopije. convert() se poziva tek na već maloj slici.
-    Pixel-count guard preskači slike koje bi i uz draft() prekoračile RAM.
+    BILINEAR umjesto LANCZOS: višestruko brže za velike slike (izbjeći Gunicorn timeout).
+    Megapixel guard čita samo header i preskače slike > 8 MP bez dekodiranja piksela.
+    except BaseException hvata i SystemExit koji Gunicorn diže na SIGABRT (worker timeout).
     """
     try:
         image_field.open('rb')
         with Image.open(image_field) as img:
-            w, h = img.size  # čita samo header, bez dekodiranja piksela
+            w, h = img.size
             if w * h > _COMPRESS_IMAGE_MAX_MEGAPIXELS * 1_000_000:
                 return None
-            img.thumbnail((max_width, max_width * 4), Image.LANCZOS)
+            img.thumbnail((max_width, max_width * 2), Image.BILINEAR)
             rgb = img.convert('RGB')
             buf = BytesIO()
-            rgb.save(buf, format='JPEG', quality=quality, optimize=True)
+            rgb.save(buf, format='JPEG', quality=quality)
             buf.seek(0)
         return buf
-    except Exception:
+    except BaseException:
         return None
     finally:
         try: