feat(Explorer): Enhance metric extraction, source transparency, and UI display

- **Standardization & Formula Logic:** Fixed NameError/SyntaxError in formula parser; added support for comments and capitalized placeholders.
- **Source URL Tracking:** Extended DB schema and cascade logic to store and track specific source URLs.
- **Frontend & UI:**
  - Added 'Standardized Potential' display in Inspector.
  - Added clickable source link with icon.
  - Fixed Settings tab layout collapse (flex-shrink-0).
- **Export Capabilities:**
  - Single-company JSON export now includes full quantitative metadata.
  - New global CSV export endpoint /api/companies/export.
- **System Integrity:**
  - Fixed Notion sync typo ('Stanardization').
  - Corrected Nginx proxy routing and FastAPI route ordering.
  - Ensured DB persistence via explicit docker-compose volume mapping.

nginx-proxy.conf

@@ -89,8 +89,8 @@ http {
 
         location /ce/ {
             # Company Explorer (Robotics Edition)
-            # Der Trailing Slash am Ende ist wichtig!
-            proxy_pass http://company-explorer:8000/;
+            # KEIN Trailing Slash, damit der /ce/ Pfad erhalten bleibt!
+            proxy_pass http://company-explorer:8000;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header Upgrade $http_upgrade;