Add sign-off receipt report and refine packing list: single-line info bar, real-glyph row height, auto-paginated detail table

- Packing list: info bar changed to a single-line three-column layout (schedule no. | order no. | box no.); packing date moved to bottom-right on the same row as the total; date separator changed to slash
- Packing list: range column widened 20->30mm; quantity/position-no./remark start shifted right 10mm; remark column narrowed to compensate; total width unchanged
- Packing list: detail cells now use line_spacing=1.0 + valign=top; separators changed to thin solid lines at row bottom (+1mm line spacing); placeholder empty rows no longer step y
- Packing list: row height estimation now uses fpdf2's same simhei glyph measured width (replacing rough character-count estimate); _clean adds control-character cleanup
- New sign-off receipt report reports/sign_receipt: master+detail linked query, ReportBro auto-paginated table, PyMuPDF stamped footer (document no. / page no. / sign-off column)
- run.py: required params now read from each report's config.yaml; default output path auto-generated; added transform.stamp_footer post-processing hook
- .gitignore: ignore .workbuddy/

reports/sign_receipt/config.yaml

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+name: sign_receipt
+title: 签收单
+description: 按签收单序列号生成 PDF（一次发货的集合视图，含多排产号多箱明细 + 收发方签收信息）
+renderer: reportbro-lib
+params:
+  receipt_no:
+    description: 签收单序列号（11位，YYYYMMDD + 3位当日序号，如 20260803001）
+    required: true
+files:
+  query.sql: 参数化查询（:receipt_no），主表头 LEFT JOIN 明细链路，按 (箱号,产品) 聚合
+  transform.py: build_context(rows) → 单头标量 + 明细预展开(r0_*..r19_*) + 行高估算
+  _build_template.py: 样式定义 + 运行时按数据动态布局的文档元素生成（无边框列表式）
+fields:
+  receipt_no: 签收单序列号（主键）
+  seq: "当日顺序号；receipt_date: 序列号日期部分"
+  shipper_name/address/phone: 发货单位/地址/电话
+  receiver_name/address/phone: 收货人/地址/电话
+  customer_order_no: 客户订单编号
+  customer_total_no: 客户提供的外部总排行号（与内部排产号无关）
+  transport_mode: 运输方式
+  ship_date: "发货日期；sign_date/signed_by: 签收日期/签收人（回写）"
+  maker: "制单人；receipt_remark: 备注"
+  r{i}_product_name: 产品名称（合同表[客户名称]）
+  r{i}_model: 产品型号
+  r{i}_range_: 量程
+  r{i}_qty: 数量
+  r{i}_contract_order_no: 合同号/订单号（合同表[订单号]）
+  r{i}_box_no: 箱号
+  total_boxes: "合计箱数（按 paichan_no+box_no 去重）；total_qty: 合计件数"
+notes:
+  - 单位：一个序列号一份 PDF（一次发货的集合视图）
+  - 纸张：A4 纵向（默认）。内容多时同 A4 纵向，本期统一 A4 纵向
+  - 排版：无边框、单色、字体驱动的列表式（复用装箱单方案，ReportBro 表格行高不自适应故弃用）
+  - 明细行预展开为标量参数 r0_*..r19_*；模板按 row_heights 累加 y 坐标定位
+  - 产品信息按总排号双表 LEFT JOIN（压力表/温度计合同表）取 COALESCE
+  - 合计箱数 = 去重 (paichan_no, box_no)；合计件数 = SUM(qty)
+  - 中文通过 additional_fonts 注册 simhei.ttf 渲染（见 core/fonts.py）
+  - 预留最多 20 行明细；超过可在 _build_template.MAX_ROWS 与 transform.MAX_ROWS 同步调大