Harden env save against empty numerics; default coin margin and hedge off.

Reject blank float/int/select on save and parse env with safe helpers so options config edits cannot crash into 502; default OKX_TRADE_MODE=options and OKX_OPTIONS_MARGIN_MODE=coin.

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

lib/env/env_schema.py

@@ -378,6 +378,32 @@ def validate_env_updates(groups: list[dict], updates: dict[str, str]) -> tuple[d
             allowed[field["key"]] = field
     clean: dict[str, str] = {}
     errors: list[str] = []
+
+    def _looks_numeric_key(k: str) -> bool:
+        u = (k or "").upper()
+        return any(
+            s in u
+            for s in (
+                "_BUFFER",
+                "_RATIO",
+                "_PERCENT",
+                "_SECONDS",
+                "_HOURS",
+                "_MINUTES",
+                "_LIMIT",
+                "_AMOUNT",
+                "_BUDGET",
+                "_CAP_",
+                "_MAX_",
+                "_MIN_",
+                "LEVERAGE",
+                "_DTE_",
+                "_USDT",
+                "_USDC",
+                "RISK_PERCENT",
+            )
+        )
+
     for key, value in (updates or {}).items():
         if key not in allowed:
             errors.append(f"未知配置项: {key}")
@@ -392,6 +418,17 @@ def validate_env_updates(groups: list[dict], updates: dict[str, str]) -> tuple[d
             errors.append(f"{key} 长度异常,疑似自动填充;留空则不修改已有密钥")
             continue
         ftype = allowed[key].get("type")
+        if val == "":
+            # 空值写入会导致 float('') / int('') 启动崩溃(曾出现 502)
+            if ftype in ("float", "int") or _looks_numeric_key(key):
+                errors.append(f"{key} 不能为空,请填写数字")
+                continue
+            if ftype == "select" or key in SELECT_OPTIONS:
+                errors.append(f"{key} 不能为空,请从下拉选择")
+                continue
+            if ftype == "bool":
+                errors.append(f"{key} 不能为空,请选择 true/false")
+                continue
         if ftype == "bool":
             low = val.lower()
             if low not in ("true", "false", "1", "0", "yes", "no", "on", "off"):
@@ -412,6 +449,23 @@ def validate_env_updates(groups: list[dict], updates: dict[str, str]) -> tuple[d
                 errors.append(f"{key} 须为: {labels}")
                 continue
             val = norm
+        elif ftype == "float" or (ftype != "int" and _looks_numeric_key(key) and "." in val):
+            try:
+                float(val)
+            except ValueError:
+                errors.append(f"{key} 须为数字")
+                continue
+            ftype = "float"
+        elif ftype == "int" or _looks_numeric_key(key):
+            try:
+                # 允许 0.98 类缓冲写成 float 键名但值是 int 也可
+                if "." in val:
+                    float(val)
+                else:
+                    int(val)
+            except ValueError:
+                errors.append(f"{key} 须为数字")
+                continue
         clean[key] = val
     return clean, errors