refactor(kyc): Remove ApiResponse response model from KYC session endpoints

- Updated KYC session endpoints to remove the ApiResponse response model, simplifying the API structure.
- Enhanced clarity in the KYC session creation, retrieval, chat, and completion methods by focusing on the payload and response data directly.
- Improved code readability and maintainability by streamlining the endpoint definitions.

docs/memory/MEMORY.md

@@ -79,6 +79,8 @@
    mysql … < scripts/agent/migrate-advisor-agent-sprint1-3.sql   # 投资顾问专用表（合并后必跑）
 5. mysql … < scripts/agent/seed-aml-list.sql       # AML 名单（Windows 乱码：`python scripts/dev/fix_utf8_seed.py`）
    python scripts/seed/import_compliance_rules.py   # 顾问合规规则（源：`docs/开发文档/20-Sprint1首批合规规则数据集.md`）
+   .\scripts\demo\seed_advisor_agent.ps1             # 一键：迁移 + 规则 + 话术 + 演示审核（推荐）
+   .\scripts\demo\seed_advisor_agent.ps1             # 一键：迁移 + 规则 + 话术 + 演示审核（推荐）
    （风控演示：`.\scripts\demo\prepare_all.ps1` 或 `prepare_risk_demo.sql` · PRD §10.2）
 6. python scripts/sync/sync_advisor_rel.py && python scripts/sync/sync_neo4j.py
 7. `docker compose up -d redis`（或 `.\scripts\dev\start-redis.ps1`）→ **REDIS_URL=redis://127.0.0.1:6380/0**（Docker Redis 7；避开本机 Windows Redis 占 6379）