feat(server): 新增附件关联/关联报销草稿后台任务与申请位置语义

- attachment_association_jobs：从票据夹批量关联附件到报销单，识别城市/日期并创建明细项，内存态 job 跟踪
- linked_reimbursement_draft_jobs：基于申请单异步生成关联报销草稿，调用 Orchestrator 编排，区分 succeeded/failed 终态
- application_location_semantics：抽取差旅出发/到达城市、判断具体地址/业务动作等位置语义，供申请单校验复用
- router 注册两个 job 端点，新增对应 job/语义单元测试

server/src/app/schemas/attachment_association_job.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+from datetime import datetime
+
+from pydantic import BaseModel, Field, field_validator
+
+
+class AttachmentAssociationJobCreate(BaseModel):
+    receipt_ids: list[str] = Field(default_factory=list, description="票据夹持久化票据 ID。")
+    prompt: str = Field(default="", max_length=1000, description="用户发送时的上下文说明。")
+    conversation_id: str = Field(default="", max_length=120, description="前端会话 ID，用于状态恢复。")
+
+    @field_validator("receipt_ids")
+    @classmethod
+    def validate_receipt_ids(cls, value: list[str]) -> list[str]:
+        receipt_ids = [
+            str(item or "").strip()
+            for item in list(value or [])
+            if str(item or "").strip()
+        ]
+        if not receipt_ids:
+            raise ValueError("请先完成附件 OCR 识别，再发起自动关联。")
+        return list(dict.fromkeys(receipt_ids))
+
+
+class AttachmentAssociationJobRead(BaseModel):
+    job_id: str
+    status: str
+    message: str = ""
+    receipt_ids: list[str] = Field(default_factory=list)
+    claim_id: str = ""
+    claim_no: str = ""
+    uploaded_count: int = 0
+    skipped_count: int = 0
+    error: str = ""
+    prompt: str = ""
+    conversation_id: str = ""
+    created_at: datetime
+    updated_at: datetime
+

server/src/app/schemas/linked_reimbursement_draft_job.py

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+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, Field, field_validator
+
+
+class LinkedReimbursementDraftJobCreate(BaseModel):
+    message: str = Field(min_length=1, max_length=3000, description="生成报销草稿的原始助手请求。")
+    context_json: dict[str, Any] = Field(default_factory=dict, description="复用 Orchestrator 的上下文。")
+    conversation_id: str = Field(default="", max_length=120, description="前端会话 ID，用于状态恢复。")
+
+    @field_validator("message")
+    @classmethod
+    def validate_message(cls, value: str) -> str:
+        normalized = str(value or "").strip()
+        if not normalized:
+            raise ValueError("请先选择要关联的申请单。")
+        return normalized
+
+
+class LinkedReimbursementDraftJobRead(BaseModel):
+    job_id: str
+    status: str
+    message: str = ""
+    error: str = ""
+    run_id: str = ""
+    conversation_id: str = ""
+    draft_payload: dict[str, Any] | None = None
+    created_at: datetime
+    updated_at: datetime