feat: 日志管理 + 质保书生产过程数据图表

- 新增 PlanLog 模型与 /logs API；计划新增/移动/投入生产/生产完成/删除均记录
  (时间/计划号/卷号/操作/状态变化/位置/操作人/说明)
- 新增「日志管理」页面 + 路由 + 导航
- 质保书：把生产完成持久化的实时数据(process_data)按单位分组生成多组柱状图

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app/api/logs.py

@@ -0,0 +1,54 @@
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, func, desc
+from typing import Optional
+from datetime import datetime
+
+from app.database import get_db
+from app.models.plan_log import PlanLog
+from app.schemas.plan import PlanLogOut
+from app.schemas.common import Response, PageResponse
+from app.services.auth_service import get_current_user
+
+router = APIRouter()
+
+
+def _parse_dt(s):
+    if not s:
+        return None
+    try:
+        return datetime.fromisoformat(s.replace('Z', ''))
+    except Exception:
+        return None
+
+
+@router.get("/", response_model=Response[PageResponse[PlanLogOut]])
+async def list_logs(
+    page: int = 1,
+    page_size: int = 50,
+    plan_no: Optional[str] = None,
+    action: Optional[str] = None,
+    operator: Optional[str] = None,
+    start_date: Optional[str] = Query(None),
+    end_date: Optional[str] = Query(None),
+    db: AsyncSession = Depends(get_db),
+    _ = Depends(get_current_user),
+):
+    query = select(PlanLog).order_by(desc(PlanLog.created_at), desc(PlanLog.id))
+    if plan_no:
+        query = query.where((PlanLog.plan_no.ilike(f"%{plan_no}%")) | (PlanLog.coil_no.ilike(f"%{plan_no}%")))
+    if action:
+        query = query.where(PlanLog.action == action)
+    if operator:
+        query = query.where(PlanLog.operator.ilike(f"%{operator}%"))
+    _sd = _parse_dt(start_date)
+    if _sd:
+        query = query.where(PlanLog.created_at >= _sd)
+    _ed = _parse_dt(end_date)
+    if _ed:
+        query = query.where(PlanLog.created_at <= _ed)
+
+    total = (await db.execute(select(func.count()).select_from(query.subquery()))).scalar()
+    result = await db.execute(query.offset((page - 1) * page_size).limit(page_size))
+    items = [PlanLogOut.model_validate(x) for x in result.scalars()]
+    return Response.ok(PageResponse(total=total, page=page, page_size=page_size, items=items))