feat(knowledge): 项目名改 zncm + 去除元链接噪音 + 创建人显示人名

- project_name 默认 deerflow → zncm（config.yaml + 配置默认 + 模块内字面量）
- related_links() 返回空：笔记 Related 不再注入 index/_meta/taxonomy/hub 结构链接，
  只保留真实相关笔记的可点 [[标题]]；无相关笔记且无来源时不再渲染 ## Related 段
- 移除随之多余的项目 hub 页脚手架（index.md/_meta/taxonomy.md 仍由 obsidian 脚手架保留，可解析）
- GET /notes/{id} 用 auth provider 把 created_by/updated_by(UUID) 解析为邮箱
  (created_by_name/updated_by_name)，前端 footer 显示人名、解析不到才显示短 id
- 仅对新沉淀笔记生效，现有笔记不动

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

offline-backend-20260512/backend/app/gateway/routers/knowledge.py

@@ -20,7 +20,7 @@ from fastapi.responses import FileResponse
 from pydantic import BaseModel, Field
 
 from app.gateway.authz import require_auth, require_permission
-from app.gateway.deps import get_checkpointer, get_knowledge_service, get_thread_store
+from app.gateway.deps import get_checkpointer, get_knowledge_service, get_local_provider, get_thread_store
 from app.gateway.utils import sanitize_log_param
 from deerflow.knowledge.service import EmptyThreadError
 from deerflow.runtime import serialize_channel_values
@@ -116,6 +116,31 @@ async def _read_thread_values(checkpointer, thread_id: str) -> dict[str, Any]:
     return serialize_channel_values(checkpoint.get("channel_values", {}) or {})
 
 
+async def _enrich_actor_names(note: dict[str, Any]) -> None:
+    """Resolve created_by/updated_by user ids to a human label (email).
+
+    Adds ``created_by_name`` / ``updated_by_name`` to the note dict so the UI can
+    show a person instead of a raw UUID. Best-effort: unresolved ids fall back to
+    ``None`` and the frontend then shows a shortened id.
+    """
+    provider = get_local_provider()
+    cache: dict[str, str | None] = {}
+
+    async def name_of(uid: str | None) -> str | None:
+        if not uid:
+            return None
+        if uid not in cache:
+            try:
+                user = await provider.get_user(uid)
+                cache[uid] = user.email if user else None
+            except Exception:
+                cache[uid] = None
+        return cache[uid]
+
+    note["created_by_name"] = await name_of(note.get("created_by"))
+    note["updated_by_name"] = await name_of(note.get("updated_by"))
+
+
 def _messages_and_meta(values: dict[str, Any]) -> tuple[list[dict[str, Any]], str | None, list[dict[str, Any]]]:
     messages = values.get("messages")
     if not isinstance(messages, list):
@@ -318,6 +343,7 @@ async def get_note(note_id: str, request: Request) -> dict[str, Any]:
     note = await service.get_note(note_id)
     if note is None:
         raise HTTPException(status_code=404, detail="Knowledge note not found")
+    await _enrich_actor_names(note)
     return note