fix: make full_margin env save/restart reliable (no empty numeric wipe).

EOF

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/env/env_ui_manifest.py

@@ -11,6 +11,7 @@ from lib.env.env_schema import (
     _is_sensitive,
     _mask_value,
     _restart_required,
+    normalize_position_sizing_mode,
     parse_env_example_schema,
 )
 
@@ -55,7 +56,7 @@ _SHARED_SECTIONS: list[dict[str, Any]] = [
     {
         "title": "交易执行",
         "fields": [
-            ("POSITION_SIZING_MODE", "计仓模式", "risk=以损定仓,full_margin=全仓杠杆"),
+            ("POSITION_SIZING_MODE", "计仓模式", "下拉选择：以损定仓 / 全仓杠杆（改后需保存并重启）"),
             ("RISK_PERCENT", "以损定仓风险%", "单笔风险占资金比例"),
             ("FULL_MARGIN_BUFFER_RATIO", "全仓资金缓冲比例", "如 0.98"),
             ("BTC_LEVERAGE", "BTC 默认杠杆", ""),
@@ -149,12 +150,25 @@ _RUNTIME_ENV_DEFAULTS: dict[str, str] = {
     "RISK_COOLING_HOURS_MANUAL_JOURNAL": "1",
     "RISK_MANUAL_CLOSE_DAILY_LIMIT": "2",
     "RISK_MOOD_ISSUES_DAILY_FREEZE": "true",
+    "RISK_PERCENT": "2",
+    "FULL_MARGIN_BUFFER_RATIO": "0.98",
+    "POSITION_SIZING_MODE": "risk",
+    "BTC_LEVERAGE": "10",
+    "ALT_LEVERAGE": "5",
+    "MAX_ACTIVE_POSITIONS": "1",
 }
 
+_POSITION_SIZING_OPTIONS: list[dict[str, str]] = [
+    {"value": "risk", "label": "以损定仓 (risk)"},
+    {"value": "full_margin", "label": "全仓杠杆 (full_margin)"},
+]
+
 
 def _effective_env_value(key: str, file_values: dict[str, str], schema_default: str = "") -> str:
     if key in file_values:
-        return file_values[key]
+        file_val = str(file_values.get(key) or "").strip()
+        if file_val != "":
+            return file_val
     runtime = os.getenv(key)
     if runtime is not None and str(runtime).strip() != "":
         return str(runtime).strip()
@@ -183,7 +197,7 @@ def _build_field(
     val = _effective_env_value(key, values, schema_default)
     masked = _mask_value(key, val)
     ftype = meta.get("type") or _field_type(key, val or schema_default)
-    return {
+    out: dict[str, Any] = {
         "key": key,
         "label": label,
         "note": note or meta.get("note") or "",
@@ -197,6 +211,15 @@ def _build_field(
         "tail": masked.get("tail") or "",
         "has_value": masked["has_value"],
     }
+    if key == "POSITION_SIZING_MODE":
+        out["type"] = "enum"
+        out["options"] = list(_POSITION_SIZING_OPTIONS)
+        cur = normalize_position_sizing_mode(out["current"] or out["default"] or "risk")
+        if cur not in ("risk", "full_margin"):
+            cur = "risk"
+        out["current"] = cur
+        out["default"] = cur
+    return out
 
 
 def ui_sections_for_exchange(exchange_key: str) -> list[dict[str, Any]]: