fix: 贡献统计去重 + 已共享内容变更可重新共享

贡献统计:
- 按配方名去重（拒绝后重新申请不重复计数）
- 已采纳+待审核+被拒绝的唯一配方名总数

已共享状态:
- 已共享配方修改内容后，对比公共库版本
- 内容不同时"已共享"消失，可重新共享
- 内容相同时保持"已共享"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/main.py

@@ -1522,27 +1522,29 @@ def my_contribution(user=Depends(get_current_user)):
         return {"adopted_count": 0, "shared_count": 0, "adopted_names": [], "pending_names": []}
     conn = get_db()
     display = user.get("display_name") or user.get("username")
-    # adopted: recipes adopted from this user
+    # adopted: unique recipe names adopted from this user
     adopted_rows = conn.execute(
-        "SELECT target_name FROM audit_log WHERE action = 'adopt_recipe' AND detail LIKE ?",
+        "SELECT DISTINCT target_name FROM audit_log WHERE action = 'adopt_recipe' AND detail LIKE ?",
         (f'%"from_user": "{display}"%',)
     ).fetchall()
-    adopted_names = [r["target_name"] for r in adopted_rows if r["target_name"]]
+    adopted_names = list(set(r["target_name"] for r in adopted_rows if r["target_name"]))
     # pending: recipes still owned by user in public library
     pending_rows = conn.execute(
         "SELECT name FROM recipes WHERE owner_id = ?", (user["id"],)
     ).fetchall()
     pending_names = [r["name"] for r in pending_rows]
-    # rejected: count recipes rejected from this user (they were deleted but logged)
-    rejected_count = conn.execute(
-        "SELECT COUNT(*) FROM audit_log WHERE action = 'reject_recipe' AND detail LIKE ?",
+    # rejected: unique recipe names rejected (not already adopted or pending)
+    rejected_rows = conn.execute(
+        "SELECT DISTINCT target_name FROM audit_log WHERE action = 'reject_recipe' AND detail LIKE ?",
         (f'%"from_user": "{display}"%',)
-    ).fetchone()[0]
+    ).fetchall()
+    rejected_names = set(r["target_name"] for r in rejected_rows if r["target_name"])
+    # Unique names across all: same recipe rejected then re-submitted counts as 1
+    all_names = set(adopted_names) | set(pending_names) | rejected_names
     conn.close()
-    total = len(adopted_names) + len(pending_names) + rejected_count
     return {
         "adopted_count": len(adopted_names),
-        "shared_count": total,
+        "shared_count": len(all_names),
         "adopted_names": adopted_names,
         "pending_names": pending_names,
     }