Fix syntax errors in MapView.vue and improve backend production robustness (CORS, DB URL, auto-migrations, and seeding)

backend/app/core/config.py

@@ -42,5 +42,12 @@ class Settings(BaseSettings):
     )
 
 
-# Global settings instance
+    # Global settings instance
+    @property
+    def get_database_url(self) -> str:
+        url = self.database_url
+        if url.startswith("postgres://"):
+            url = url.replace("postgres://", "postgresql://", 1)
+        return url
+
 settings = Settings()