feat: 新增票据夹模块并优化 OCR 与员工画像服务

后端新增票据夹端点、数据模型和服务模块，优化 OCR 端点
Schema 和附件操作逻辑，完善员工行为画像服务和辅助函数，
前端新增票据夹视图和服务层，优化文档中心样式和侧边栏导
航，完善员工画像详情弹窗和权限控制，补充单元测试。

server/src/app/schemas/ocr.py

@@ -39,6 +39,10 @@ class OcrRecognizeDocumentRead(BaseModel):
     )
     preview_kind: str = Field(default="", description="预览类型，PDF 转图后通常为 image。")
     preview_data_url: str = Field(default="", description="用于前端展示的图片预览 data URL。")
+    receipt_id: str = Field(default="", description="票据夹中的持久化票据 ID。")
+    receipt_status: str = Field(default="", description="票据夹关联状态，unlinked / linked。")
+    receipt_preview_url: str = Field(default="", description="票据夹预览接口地址。")
+    receipt_source_url: str = Field(default="", description="票据夹原始文件接口地址。")
     warnings: list[str] = Field(default_factory=list, description="该文件的识别提示或警告。")
     lines: list[OcrRecognizeLineRead] = Field(default_factory=list, description="逐行识别结果。")
 

server/src/app/schemas/receipt_folder.py

@@ -0,0 +1,68 @@
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+class ReceiptFolderFieldRead(BaseModel):
+    key: str = ""
+    label: str = ""
+    value: str = ""
+
+
+class ReceiptFolderItemRead(BaseModel):
+    id: str
+    file_name: str
+    media_type: str = "application/octet-stream"
+    size_bytes: int = 0
+    status: str = "unlinked"
+    status_label: str = "未关联"
+    document_type: str = "other"
+    document_type_label: str = "其他单据"
+    scene_code: str = "other"
+    scene_label: str = "其他票据"
+    summary: str = ""
+    amount: str = ""
+    document_date: str = ""
+    merchant_name: str = ""
+    avg_score: float = 0.0
+    uploaded_at: datetime | None = None
+    linked_at: datetime | None = None
+    linked_claim_id: str = ""
+    linked_claim_no: str = ""
+    previewable: bool = False
+    preview_kind: str = ""
+    preview_url: str = ""
+    source_url: str = ""
+    warnings: list[str] = Field(default_factory=list)
+
+
+class ReceiptFolderDetailRead(ReceiptFolderItemRead):
+    engine: str = ""
+    model: str = ""
+    ocr_text: str = ""
+    line_count: int = 0
+    page_count: int = 1
+    classification_confidence: float = 0.0
+    classification_evidence: list[str] = Field(default_factory=list)
+    fields: list[ReceiptFolderFieldRead] = Field(default_factory=list)
+    raw_meta: dict[str, Any] = Field(default_factory=dict)
+
+
+class ReceiptFolderUpdate(BaseModel):
+    document_type: str | None = None
+    document_type_label: str | None = None
+    scene_code: str | None = None
+    scene_label: str | None = None
+    summary: str | None = None
+    amount: str | None = None
+    document_date: str | None = None
+    merchant_name: str | None = None
+    fields: list[ReceiptFolderFieldRead] | None = None
+
+
+class ReceiptFolderDeleteResponse(BaseModel):
+    message: str
+    receipt_id: str