feat(config): switch proxy to SOCKS5 and add auth options

The proxy configuration now uses a SOCKS5 scheme instead of MTProto. The default port is updated to 1080 and optional username/password fields are supported. Docker compose comments are updated accordingly.

BREAKING CHANGE: existing MTProto proxy settings (scheme "mtproto", port 443) are no longer supported and must be migrated to SOCKS5.

config.py

@@ -47,15 +47,18 @@ def get_settings() -> dict[str, Any]:
 
     log_level = os.getenv("LOG_LEVEL", "INFO")
 
-    # Build MTProto proxy config if proxy host is provided
+    # Build MTProto proxy config if proxy host is provided.
+    # Telegram MTProto proxy (telegrammessenger/proxy) exposes a SOCKS5 interface,
+    # so Pyrogram connects to it via SOCKS5 scheme.
     proxy_host = os.getenv("TG_PROXY_HOST")
     proxy: dict[str, Any] | None = None
     if proxy_host:
         proxy = {
-            "scheme": "mtproto",
+            "scheme": "SOCKS5",
             "hostname": proxy_host,
-            "port": int(os.getenv("TG_PROXY_PORT") or 443),
-            "secret": os.getenv("TG_PROXY_SECRET", ""),
+            "port": int(os.getenv("TG_PROXY_PORT") or 1080),
+            "username": os.getenv("TG_PROXY_USERNAME") or None,
+            "password": os.getenv("TG_PROXY_PASSWORD") or None,
         }
 
     return {

dockercompose.yml

@@ -8,9 +8,10 @@ services:
     environment:
       TG_API_ID: XXX
       TG_API_HASH: XXX
-      # TG_PROXY_HOST: 127.0.0.1     # MTProto proxy host (optional)
-      # TG_PROXY_PORT: 443            # MTProto proxy port (default: 443)
-      # TG_PROXY_SECRET: XXX          # MTProto proxy secret
+      # TG_PROXY_HOST: 127.0.0.1     # MTProto proxy host, SOCKS5 interface (optional)
+      # TG_PROXY_PORT: 1080           # MTProto proxy SOCKS5 port (default: 1080)
+      # TG_PROXY_USERNAME: XXX        # SOCKS5 username (optional)
+      # TG_PROXY_PASSWORD: XXX        # SOCKS5 password (optional)
       PYROGRAM_BRIDGE_URL: https://pgbridge.example.com
       API_PORT: 80
       TOKEN: ХХХ