Auto-fill journal direction from trade records.

Add a required direction field on the review form, persist it, and set long/short when clicking 填入复盘.

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

lib/instance/journal_form_lib.py

@@ -42,3 +42,13 @@ def journal_entry_reason_valid(raw: Optional[str], allowed: Sequence[str]) -> bo
 
 def journal_order_type_valid(raw: Optional[str]) -> bool:
     return bool(normalize_journal_order_type(raw))
+
+
+def normalize_journal_direction(raw: Optional[str]) -> str:
+    s = (raw or "").strip().lower()
+    if s in ("long", "buy", "多", "做多"):
+        return "long"
+    if s in ("short", "sell", "空", "做空"):
+        return "short"
+    # 兼容旧隐藏字段 direction_hint
+    return ""