refactor deployment config and exchange integrations

Simplify runtime configuration and remove legacy database and settings surface so new installs are easier to operate.
Refresh deployment assets, docs, and order execution behavior to keep the packaged app aligned with the current backend.

Made-with: Cursor

.dockerignore

@@ -5,12 +5,12 @@
 **/.git
 .DS_Store
 
-# Do not send local node_modules / build outputs (Docker runs npm ci + build)
+# Do not send unused frontend source build artifacts
 QuantDinger-Vue-src/node_modules
 QuantDinger-Vue-src/dist
 
-# Pre-built copy used for local nginx tests only — image builds from source
-frontend/dist
+# The open-source repo ships prebuilt frontend assets in `frontend/dist`,
+# and the frontend image copies them directly, so keep this directory included.
 
 # Backend & DB not needed for frontend stage
 backend_api_python