Fix saved output files showing across all clients

- Auto-save reports to client-specific subfolder (was saving to root)
- Read client_id from form data (matching what frontend sends)
- Add Amazon to profile-based client detection fallback
- Fix get_client_from_profile matching 'static' as L'Oreal

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

backend/api_server.py

@@ -754,12 +754,14 @@ def get_client_from_profile(profile_id):
         return 'general'
 
     profile_lower = profile_id.lower()
-    if 'loreal' in profile_lower or 'static' in profile_lower:
+    if profile_lower.startswith('loreal'):
         return 'loreal'
-    elif 'diageo' in profile_lower:
+    elif profile_lower.startswith('diageo'):
         return 'diageo'
-    elif 'unilever' in profile_lower:
+    elif profile_lower.startswith('unilever'):
         return 'unilever'
+    elif profile_lower.startswith('amazon'):
+        return 'amazon'
     else:
         return 'general'
 
@@ -1563,7 +1565,7 @@ def start_analysis():
         file.save(file_path)
 
         # Derive client from profile if not provided
-        client = request.form.get('client', 'general').lower()
+        client = request.form.get('client_id', request.form.get('client', 'general')).lower()
         if not client or client == 'general':
             if profile.startswith('diageo_'):
                 client = 'diageo'
@@ -1571,6 +1573,8 @@ def start_analysis():
                 client = 'unilever'
             elif profile.startswith('loreal_'):
                 client = 'loreal'
+            elif profile.startswith('amazon_'):
+                client = 'amazon'
             else:
                 client = 'general'
 
@@ -3185,10 +3189,11 @@ def api_analyze_with_triage():
             # Generate comprehensive HTML report using the same format as the web UI
             html_report_content = generate_comprehensive_html_report(response_data, file.filename, file_path)
             
-            # Create output filename
+            # Create output filename in client-specific folder
             safe_filename = re.sub(r'[^a-zA-Z0-9.-]', '_', file.filename)
             output_filename = f"{session_id}_{safe_filename}_report.html"
-            output_path = os.path.join(app.config['OUTPUT_FOLDER'], output_filename)
+            client_output_folder = ensure_client_output_folder(client)
+            output_path = os.path.join(client_output_folder, output_filename)
             
             # Save HTML report to output directory
             with open(output_path, 'w', encoding='utf-8') as f: