Merge main into f/updates

Resolved conflicts by keeping f/updates changes:
- Keep Angular frontend with dark theme styling
- Keep updated quickstart scripts at root level
- Remove static HTML/JS files (replaced by Angular)
- Keep sim_source_id field implementation
- Merge backend improvements from main

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3.8'
 
 services:
   postgres:
-    image: postgres:15
+    image: postgres:15-alpine
     environment:
       POSTGRES_USER: user
       POSTGRES_PASSWORD: password