完善：删除用户接口增加完整级联删除逻辑

核心改动：
1. 删除用户前先级联删除所有相关数据（60+张表）：
   - 认证与信用：certifications、skill_tests、credit_scores、credit_ledger、credit_dimensions、user_badges
   - IM/消息：messages、dm_messages、notifications
   - 服务大厅：opc_services、service_inquiries、service_orders、community_posts、community_comments、community_likes、community_follows
   - 培训：training_enrollments、training_course_enrollments、training_lesson_progress、training_certificates
   - 招聘：jobs、job_applications
   - 人才：talent_profiles
   - 用户主页：user_pages、user_page_review_logs
   - 邀请：invite_records（同时删除作为邀请人的记录）
   - 财务：finance_records、escrows、contracts、invoices、disputes、ratings
   - 任务：tasks、task_claims、task_deliveries、task_milestones、task_acceptances
   - 园区/企业：park_members、company_members、park_admissions、park_transfers（同时删除作为负责人的企业）
   - 内容互动：content_likes、content_comments、content_comment_likes
   - 其他：sessions、agents、opc_profiles、investor_preferences、roadshow_registrations等

2. 安全防护：
   - 防止删除当前登录账号
   - 级联删除失败的表自动跳过，不影响主流程
   - 返回级联删除的记录数量

3. 算力引擎同步删除：
   - 删除用户后同步删除算力引擎中的账号
   - 失败不阻断主流程

4. 审计日志：
   - 记录删除操作和级联删除数量

app/api/routers/rbac_admin.py

@@ -177,23 +177,113 @@ async def update_user(
     return {"ok": True, "user": await db.users.to_profile(user)}
 
 
-@router.delete("/users/{user_id}", summary="删除用户")
+@router.delete("/users/{user_id}", summary="删除用户（级联删除所有相关数据）")
 async def delete_user(
     user_id: str,
     request: Request,
     db: Database = Depends(get_db),
     actor: dict = Depends(require_permission("action:user.manage")),
 ):
+    from sqlalchemy import text as sql_text
+
     user = await db.users.get_by_id(user_id)
+    if user is None:
+        raise HTTPException(status_code=404, detail="用户不存在")
+
+    # 防止删除自己
+    if actor.get("id") == user_id:
+        raise HTTPException(status_code=400, detail="不能删除当前登录账号")
+
+    username = user.get("username", "")
+
+    # ═══════════════════════════════════════════════════════════
+    # 级联删除所有与用户相关的数据
+    # ═══════════════════════════════════════════════════════════
+    cascade_tables = [
+        # 认证与信用
+        "certifications", "skill_tests", "credit_scores", "credit_ledger",
+        "credit_dimensions", "user_badges",
+        # IM/消息/通知
+        "messages", "dm_messages", "notifications",
+        # 服务大厅
+        "opc_services", "service_inquiries", "service_orders",
+        "community_posts", "community_comments", "community_likes", "community_follows",
+        # 培训
+        "training_enrollments", "training_course_enrollments",
+        "training_lesson_progress", "training_certificates",
+        # 招聘
+        "jobs", "job_applications",
+        # 人才
+        "talent_profiles",
+        # 用户主页
+        "user_pages", "user_page_review_logs",
+        # 邀请
+        "invite_records",
+        # 财务
+        "finance_records", "escrows", "contracts", "invoices",
+        "disputes", "ratings",
+        # 任务
+        "tasks", "task_claims", "task_deliveries", "task_milestones", "task_acceptances",
+        # 园区/企业成员关系
+        "park_members", "company_members",
+        "park_admissions", "park_transfers",
+        # 内容互动
+        "content_likes", "content_comments", "content_comment_likes",
+        # 其他
+        "sessions", "agents", "opc_profiles",
+        "investor_preferences", "roadshow_registrations", "investment_intents",
+        "bids", "subsidy_applications", "service_referrals",
+        "bookings", "tests", "policy_logs", "plan_logs", "survey_logs",
+        "incubator_monthly_reports", "incubator_area_reservations",
+        "market_purchase_orders", "market_purchases",
+    ]
+
+    deleted_count = 0
+    for table in cascade_tables:
+        try:
+            result = await db.session.execute(
+                sql_text(f"DELETE FROM {table} WHERE user_id = :uid"),
+                {"uid": user_id}
+            )
+            deleted_count += result.rowcount or 0
+        except Exception as e:
+            # 表不存在或字段不存在时跳过，不影响主流程
+            print(f"[delete_user] 跳过表 {table}: {e}")
+            await db.session.rollback()
+
+    # 删除作为邀请人的邀请记录（inviter_id 字段）
+    try:
+        await db.session.execute(
+            sql_text("DELETE FROM invite_records WHERE inviter_id = :uid"),
+            {"uid": user_id}
+        )
+    except Exception:
+        await db.session.rollback()
+
+    # 删除作为负责人的企业（owner_user_id 字段）
+    try:
+        await db.session.execute(
+            sql_text("DELETE FROM park_companies WHERE owner_user_id = :uid"),
+            {"uid": user_id}
+        )
+    except Exception:
+        await db.session.rollback()
+
+    # 提交级联删除
+    await db.session.commit()
+
+    # 硬删除用户主记录
     ok = await db.users.delete(user_id)
     if not ok:
-        raise HTTPException(status_code=404, detail="User not found")
-    # 平台用户删除 → 引擎镜像同步删除
-    if user:
-        await _sync_compute(compute_client.sync_delete_user(user.get("username")))
+        raise HTTPException(status_code=404, detail="用户删除失败")
+
+    # 平台用户删除 → 引擎镜像同步删除（算力、IM等）
+    if username:
+        await _sync_compute(compute_client.sync_delete_user(username))
+
     await write_audit(db, action="user.delete", resource="user", resource_id=user_id,
-                detail="deleted", user=actor, request=request)
-    return {"ok": True, "user_id": user_id}
+                detail=f"deleted, cascade_deleted={deleted_count} records", user=actor, request=request)
+    return {"ok": True, "user_id": user_id, "username": username, "cascade_deleted": deleted_count}
 
 
 @router.get("/roles", summary="角色列表")