fix(company): convert uploaded logos to .webp so templates display them

Templates expect logo at {slug}.webp with SVG fallback. When users uploaded
JPG/PNG files, the logo was saved with original extension and never displayed.
Now all raster uploads are converted to .webp via Pillow; SVG stays as-is.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

blueprints/public/routes_company_edit.py

@@ -237,12 +237,12 @@ def _save_description(db, company):
     else:
         company.category_id = None
 
-    # Logo upload — save as static/img/companies/{slug}.{ext}
-    # company_detail.html expects logo at this path with webp→svg fallback
+    # Logo upload — always convert to .webp (templates expect {slug}.webp)
     logo_file = request.files.get('logo_file')
     if logo_file and logo_file.filename:
         import os
-        from werkzeug.utils import secure_filename
+        from PIL import Image
+        import io
 
         allowed = {'png', 'jpg', 'jpeg', 'svg', 'webp'}
         ext = logo_file.filename.rsplit('.', 1)[-1].lower() if '.' in logo_file.filename else ''
@@ -254,8 +254,14 @@ def _save_description(db, company):
                 old_path = os.path.join(logo_dir, f"{company.slug}.{old_ext}")
                 if os.path.exists(old_path):
                     os.remove(old_path)
-            filepath = os.path.join(logo_dir, f"{company.slug}.{ext}")
-            logo_file.save(filepath)
+            filepath = os.path.join(logo_dir, f"{company.slug}.webp")
+            if ext == 'svg':
+                # SVG stays as-is (can't convert to webp)
+                filepath = os.path.join(logo_dir, f"{company.slug}.svg")
+                logo_file.save(filepath)
+            else:
+                img = Image.open(logo_file)
+                img.save(filepath, 'WEBP', quality=85)
             logger.info(f"Logo uploaded for company {company.id}: {filepath}")