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

backend_api_python/app/config/data_sources.py

@@ -130,30 +130,13 @@ class MetaCCXTConfig(type):
 
     @property
     def PROXY(cls):
-        from app.utils.config_loader import load_addon_config
-        val = load_addon_config().get('ccxt', {}).get('proxy')
-        if val:
-            return val
-
-        # 1) Direct CCXT proxy env
-        ccxt_proxy = (os.getenv('CCXT_PROXY') or '').strip()
-        if ccxt_proxy:
-            return ccxt_proxy
-
-        # 2) Local proxy helpers from backend_api_python/.env
+        # 1) Local proxy helpers from backend_api_python/.env
         # PROXY_URL has the highest priority if provided.
         proxy_url = (os.getenv('PROXY_URL') or '').strip()
         if proxy_url:
             return proxy_url
 
-        # Build from parts: PROXY_SCHEME/PROXY_HOST/PROXY_PORT
-        proxy_port = (os.getenv('PROXY_PORT') or '').strip()
-        if proxy_port:
-            proxy_scheme = (os.getenv('PROXY_SCHEME') or 'socks5h').strip()
-            proxy_host = (os.getenv('PROXY_HOST') or '127.0.0.1').strip()
-            return f"{proxy_scheme}://{proxy_host}:{proxy_port}"
-
-        # 3) Standard proxy envs (fallback)
+        # 2) Standard proxy envs (fallback)
         for key in ['HTTPS_PROXY', 'HTTP_PROXY', 'ALL_PROXY']:
             v = (os.getenv(key) or '').strip()
             if v: