fix: 修复单测以适配 vectordb 接口重构，统一测试数据路径

[qin-ctx]

概要

• 修复多处代码以适配 Feat/vectordb interface refactor #327 vectordb 接口重构后的单测失败
• 统一所有测试数据路径至 test_data/ 目录，清理 .gitignore 中的散落条目
• 修复若干运行时边界问题（filesystem stat 错误匹配、queue manager 未初始化、HTTP client 关闭异常）

改动内容

• openviking/server/routers/filesystem.py: stat 错误匹配增加 "not found" 判断
• openviking/server/routers/resources.py: 为 AddResourceRequest 添加 model_validator 校验
• openviking/service/debug_service.py: 处理 queue manager 未初始化时的异常
• openviking/storage/collection_schemas.py: 简化 record ID 生成，移除 owner_space
• openviking_cli/client/http.py: 捕获 aclose() 的 RuntimeError
• tests/: 统一测试数据路径至 test_data/，适配 get_context_by_uri() 等新接口，移除 VikingDBInterface mock 依赖

测试计划

• 运行 pytest tests/ 验证所有单测通过
• 确认 test_data/ 目录在测试运行后正确生成和清理

close #326

🤖 Generated with Claude Code

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}