feat(parsers): add SOAP API support for zakupki.gov.ru

- Add post() method to BaseHTTPClient for SOAP requests
- Update download_file() to support custom headers (for token)
- Add ZAKUPKI_TOKEN and PARSER_PROXIES settings
- Improve SOAP error parsing to show EIS error messages
- Update E2E tests to use token from settings
- Add data/ and .zed/ to gitignore

src/config/settings/base.py

@@ -221,6 +221,21 @@ CACHES = {
 }
 
 
+# =============================================================================
+# PARSERS SETTINGS
+# =============================================================================
+
+# Zakupki.gov.ru API Token (получить через Госуслуги)
+ZAKUPKI_TOKEN = get_env("ZAKUPKI_TOKEN", "")
+
+# Proxy list for parsers (comma-separated)
+PARSER_PROXIES = get_env("PARSER_PROXIES", "")
+if isinstance(PARSER_PROXIES, str) and PARSER_PROXIES:
+    PARSER_PROXIES = [p.strip() for p in PARSER_PROXIES.split(",") if p.strip()]
+else:
+    PARSER_PROXIES = []
+
+
 # Password validation
 AUTH_PASSWORD_VALIDATORS = [
     {