Feat/memory link

[chenjw]

Description

1. 修复vlm配置中的thinking参数无效的问题。
2. 加强字段级别的language指定。
3. 支持字段级别的searchable属性，控制是否进embedding
4. 支持记忆文件间的链接提取，默认关闭，通过ov.conf配置打开
   "memory" : {
   "link_enabled": true
   },
5. 在relations下支持build_graph命令，为子目录生成graph可视化文件。
   curl -X POST "http://127.0.0.1:1933/api/v1/relations/build_graph"
   -H "Content-Type: application/json"
   -H "X-API-Key: default"
   -H "X-OpenViking-Account: default"
   -H "X-OpenViking-User: agent_sample_5"
   -d '{
   "space_uris": [
   "viking://user",
   "viking://agent"
   ],
   "output_uri":
   "viking://.combined.graph.html"
   }'
6. 优化了patch机制：（1）原始内容带行号；（2）patch失败增加了一次llm重试。
7. profile.yaml进行了简化，偏好相关信息强制挪到prefrences.yaml
8. locomo 81%指标正常。

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

[qin-ctx]

这次 review 结论是 REQUEST_CHANGES。核心问题集中在 page_id/link 生命周期没有闭环，并且当前 CI 的 lint job 失败。

Blocking：

1. PageIdMap 的实现和新增测试/设计不一致，PR head 上单跑 tests/unit/session/memory/test_page_id_map.py 会出现 16 个 AttributeError。
2. 多 URI / 多用户场景下同一个 page_id 会被后续 URI 覆盖，link resolution 会指向错误文件。
3. page_id map 没有挂到 ExtractContext，supplement_operation_uris() 读取不到它，page_id 锚定编辑不会生效。
4. CI lint 失败：ruff format --check 报 24 个文件需要 reformat。

Non-blocking：PR 目前有 76 个文件和 96 个 commits，且包含 memory link、VLM thinking、patch、profile 模板、path lock 等多条独立行为线；建议拆分或 squash。PR body 也还保留模板占位，未关联 issue、未勾选类型/测试项，需要补齐。

[qin-ctx]

本次复查仍发现一个 blocking 问题：new page_id 的多 URI 写入会在 apply 阶段被压成单 URI，需要修复后再合并。