feat: 用户软删除+30天自动清理，操作日志共享配方统一显示

用户删除改为软删除(deleted标记)，撤销时数据完整恢复（配方/收藏/库存等）。
30天后自动硬删除清理。操作日志中共享配方和采纳配方统一显示为"共享配方"。

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

backend/main.py

@@ -57,7 +57,7 @@ def get_current_user(request: Request):
     if not token:
         return ANON_USER
     conn = get_db()
-    user = conn.execute("SELECT id, username, role, display_name, password, business_verified FROM users WHERE token = ?", (token,)).fetchone()
+    user = conn.execute("SELECT id, username, role, display_name, password, business_verified FROM users WHERE token = ? AND NOT deleted", (token,)).fetchone()
     conn.close()
     if not user:
         return ANON_USER
@@ -373,7 +373,7 @@ def login(body: dict):
     if not username or not password:
         raise HTTPException(400, "请输入用户名和密码")
     conn = get_db()
-    user = conn.execute("SELECT id, token, password, display_name, role FROM users WHERE username = ?", (username,)).fetchone()
+    user = conn.execute("SELECT id, token, password, display_name, role FROM users WHERE username = ? AND NOT deleted", (username,)).fetchone()
     if not user:
         conn.close()
         raise HTTPException(401, "用户名不存在")
@@ -747,7 +747,7 @@ def list_recipes(user=Depends(get_current_user)):
     if user["role"] == "admin":
         rows = conn.execute("SELECT id, name, note, owner_id, version, en_name FROM recipes ORDER BY id").fetchall()
     else:
-        admin = conn.execute("SELECT id FROM users WHERE role = 'admin' LIMIT 1").fetchone()
+        admin = conn.execute("SELECT id FROM users WHERE role = 'admin' AND NOT deleted LIMIT 1").fetchone()
         admin_id = admin["id"] if admin else 1
         user_id = user.get("id")
         if user_id:
@@ -786,7 +786,7 @@ def create_recipe(recipe: RecipeIn, user=Depends(get_current_user)):
     # Senior editors adding directly to public library: set owner to admin so everyone can see
     owner_id = user["id"]
     if user["role"] in ("senior_editor",):
-        admin = c.execute("SELECT id FROM users WHERE role = 'admin' LIMIT 1").fetchone()
+        admin = c.execute("SELECT id FROM users WHERE role = 'admin' AND NOT deleted LIMIT 1").fetchone()
         if admin:
             owner_id = admin["id"]
     c.execute("INSERT INTO recipes (name, note, owner_id) VALUES (?, ?, ?)",
@@ -800,7 +800,9 @@ def create_recipe(recipe: RecipeIn, user=Depends(get_current_user)):
     for tag in recipe.tags:
         c.execute("INSERT OR IGNORE INTO tags (name) VALUES (?)", (tag,))
         c.execute("INSERT OR IGNORE INTO recipe_tags (recipe_id, tag_name) VALUES (?, ?)", (rid, tag))
-    log_audit(conn, user["id"], "create_recipe", "recipe", rid, recipe.name)
+    # Only log for admin/senior_editor direct adds (share); others wait for adopt
+    if user["role"] in ("admin", "senior_editor"):
+        log_audit(conn, user["id"], "share_recipe", "recipe", rid, recipe.name)
     who = user.get("display_name") or user["username"]
     if user["role"] == "senior_editor":
         # Senior editor adds directly — just inform admin
@@ -1061,7 +1063,7 @@ def delete_tag(name: str, user=Depends(require_role("admin"))):
 @app.get("/api/users")
 def list_users(user=Depends(require_role("admin"))):
     conn = get_db()
-    rows = conn.execute("SELECT id, username, token, role, display_name, created_at, business_verified FROM users ORDER BY id").fetchall()
+    rows = conn.execute("SELECT id, username, token, role, display_name, created_at, business_verified FROM users WHERE NOT deleted ORDER BY id").fetchall()
     conn.close()
     return [dict(r) for r in rows]
 
@@ -1090,14 +1092,12 @@ def delete_user(user_id: int, user=Depends(require_role("admin"))):
     if user_id == user["id"]:
         raise HTTPException(400, "不能删除自己")
     conn = get_db()
-    target = conn.execute("SELECT id, username, token, role, display_name FROM users WHERE id = ?", (user_id,)).fetchone()
+    target = conn.execute("SELECT id, username, display_name FROM users WHERE id = ? AND NOT deleted", (user_id,)).fetchone()
     if not target:
         conn.close()
         raise HTTPException(404, "User not found")
-    snapshot = dict(target)
-    conn.execute("DELETE FROM users WHERE id = ?", (user_id,))
-    log_audit(conn, user["id"], "delete_user", "user", user_id, target["username"],
-              json.dumps(snapshot, ensure_ascii=False))
+    conn.execute("UPDATE users SET deleted = 1, deleted_at = datetime('now') WHERE id = ?", (user_id,))
+    log_audit(conn, user["id"], "delete_user", "user", user_id, target["username"])
     conn.commit()
     conn.close()
     return {"ok": True}
@@ -1141,11 +1141,15 @@ def undo_action(log_id: int, user=Depends(require_role("admin"))):
 
     action = entry["action"]
     detail = entry["detail"]
-    if not detail:
+
+    if action == "delete_user":
+        # Soft-delete undo — no snapshot needed
+        pass
+    elif not detail:
         conn.close()
         raise HTTPException(400, "此操作无法撤销（无快照数据）")
 
-    snapshot = json.loads(detail)
+    snapshot = json.loads(detail) if detail else {}
 
     if action == "delete_recipe":
         # Restore recipe from snapshot
@@ -1176,16 +1180,15 @@ def undo_action(log_id: int, user=Depends(require_role("admin"))):
         return {"ok": True}
 
     elif action == "delete_user":
-        try:
-            conn.execute(
-                "INSERT INTO users (username, token, role, display_name) VALUES (?, ?, ?, ?)",
-                (snapshot["username"], snapshot["token"], snapshot["role"], snapshot.get("display_name", "")))
-            log_audit(conn, user["id"], "undo_delete_user", "user", snapshot["username"], snapshot.get("display_name"),
-                      json.dumps({"original_log_id": log_id}))
-            conn.commit()
-        except Exception:
+        target_id = entry["target_id"]
+        target_user = conn.execute("SELECT id, username, display_name, deleted FROM users WHERE id = ?", (target_id,)).fetchone()
+        if not target_user or not target_user["deleted"]:
             conn.close()
-            raise HTTPException(400, "恢复失败（用户名可能已被占用）")
+            raise HTTPException(400, "该用户未被删除或不存在")
+        conn.execute("UPDATE users SET deleted = 0, deleted_at = NULL WHERE id = ?", (target_id,))
+        log_audit(conn, user["id"], "undo_delete_user", "user", target_user["username"], target_user["display_name"],
+                  json.dumps({"original_log_id": log_id}))
+        conn.commit()
         conn.close()
         return {"ok": True}
 
@@ -1687,7 +1690,7 @@ def mark_notification_added(nid: int, user=Depends(get_current_user)):
         requester_name = body_text.split(" 搜索了")[0].strip()
         # Find the user
         requester = conn.execute(
-            "SELECT id, role FROM users WHERE display_name = ? OR username = ?",
+            "SELECT id, role FROM users WHERE (display_name = ? OR username = ?) AND NOT deleted",
             (requester_name, requester_name)
         ).fetchone()
         if requester:
@@ -1731,7 +1734,7 @@ def weekly_review(user=Depends(require_role("admin"))):
     conn = get_db()
 
     # 1. Pending recipes for admin review
-    admin = conn.execute("SELECT id FROM users WHERE role = 'admin' LIMIT 1").fetchone()
+    admin = conn.execute("SELECT id FROM users WHERE role = 'admin' AND NOT deleted LIMIT 1").fetchone()
     admin_id = admin["id"] if admin else 1
     pending = conn.execute(
         "SELECT COUNT(*) as cnt FROM recipes WHERE owner_id != ?", (admin_id,)
@@ -1800,9 +1803,30 @@ def delete_category(cat_id: int, user=Depends(require_role("admin"))):
 FRONTEND_DIR = os.environ.get("FRONTEND_DIR", "/app/frontend")
 
 
+def purge_deleted_users():
+    """Hard-delete users that were soft-deleted more than 30 days ago, along with their related data."""
+    conn = get_db()
+    expired = conn.execute(
+        "SELECT id FROM users WHERE deleted AND deleted_at < datetime('now', '-30 days')"
+    ).fetchall()
+    for row in expired:
+        uid = row["id"]
+        conn.execute("DELETE FROM user_diary WHERE user_id = ?", (uid,))
+        conn.execute("DELETE FROM user_favorites WHERE user_id = ?", (uid,))
+        conn.execute("DELETE FROM user_inventory WHERE user_id = ?", (uid,))
+        conn.execute("DELETE FROM business_applications WHERE user_id = ?", (uid,))
+        conn.execute("DELETE FROM notifications WHERE target_user_id = ?", (uid,))
+        conn.execute("DELETE FROM users WHERE id = ?", (uid,))
+    if expired:
+        conn.commit()
+        print(f"[CLEANUP] Purged {len(expired)} users deleted >30 days ago")
+    conn.close()
+
+
 @app.on_event("startup")
 def startup():
     init_db()
+    purge_deleted_users()
     defaults_path = os.path.join(os.path.dirname(__file__), "defaults.json")
     if os.path.exists(defaults_path):
         with open(defaults_path) as f: