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打通 oshwhub origin=pro 现代 Pro 3.x 工程的 EPRO2 源抓取链路。3/5
modern Pro 项目完整解出（共 8423 docs / 542 MB plain）：
- X86 主板 7374 docs / 481 MB plain (chain=85, editor=3.2.15)
- 220V 桌面电源 771 docs / 26 MB plain (chain=28, editor=3.2.69)
- ESP-VoCat 278 docs / 7.5 MB plain (chain=12, editor=3.2.91)
剩余 2/5 是 legacy Pro 2.x（立创泰山派 RK3566、梁山派），项目 meta
返回 branch_uuid=null + editorVersion="2.1.40"，没有 git-style chain
模型，文档直接挂在 boards[].sch/pcb 字段上，访问端点暂未挖通；元
数据落库 metadata.json，source/ 留空。
实现要点：
- fetch_pro_source(): 4 步流程（project → branch HEAD → structures
→ /branches/<B>/histories/<HEAD> 即返完整 chain，无需 ?limit 批量
端点）+ 逐 history 走 AES-128-GCM 解密（16 字节 IV，pycryptodome
原生支持）+ gunzip + 按 DOCHEAD 切 per-doc EPRO2 流
- EPRO2 解析坑：行末单 `|` 是行终止符不是字段分隔符，必须先
rstrip("|") 再 split("||")，否则 payload JSON 解析失败 silently
swallow 导致 cur_doc 不设 → 第一轮 X86 板 7374 docs 抽出来只剩 2 个
- docType 实测远不止 BOARD/PCB/SCH/SCH_PAGE，还含 SYMBOL /
FOOTPRINT / DEVICE / BLOB / FONT / CONFIG —— Pro 把组件库快照也
随项目存到 history，下游做 EPRO2→KiCad 转换时必须先把这些 lib
doc 加载进 symbol cache
- Pro 2.x vs 3.x 是不同存储模型 —— 3.x 走 branch 模型（已打通），
2.x 走 boards[] 直链（未打通）；判别条件：project meta 的
branch_uuid 是否为 null
CLI 新增 --with-pro-source / --backfill-pro-source / --pro-cookie /
--origin（按 origin 字段服务端过滤 listing API），crawl_one() 按
origin=pro 自动 dispatch 到 Pro fetcher。
schema：docType 类型从 integer 放宽到 [integer, string, null]
（兼容 Std 的 1/3 + Pro 的 BOARD/SCH 等），新增 message_count 字段。
License 注意：本批 5 个项目全是 NC-SA / GPL，未达 Pro source doc
§4.2 Forge 白名单（MIT/BSD/Apache/CC0/CC-BY/CERN-OHL-P/Unlicense）。
按 CLAUDE.md "研究用、不再分发" 原则 raw 入库无碍；Forge 投影时
另过白名单。
详细技术细节见 docs/sources/easyeda_pro_source.md rev 3 + log.md。
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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{"type":"DOCHEAD","ticket":1743}||{"docType":"DEVICE","client":"5796efe0-71be-4764-a7be-8620972bb90b","uuid":"aa16670286c34bf49a4bfc7d267372b5","updateTime":1735986458000,"version":"1665448802","user":{"uuid":"f6d958b048194965970a097419f0f68a","nickname":"重庆枫叶","username":"cqlcp","avatar":"//image.lceda.cn/avatars/2026/1/FneZQD4JKfDDm92UUIa483axw2OD9PF1E07L9Aby.webp"}}|
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{"type":"DOCHEAD","ticket":1744}||{"docType":"DEVICE","client":"5796efe0-71be-4764-a7be-8620972bb90b","uuid":"aa16670286c34bf49a4bfc7d267372b5","updateTime":1735986458000,"version":"1665448802","user":{"uuid":"f6d958b048194965970a097419f0f68a","nickname":"重庆枫叶","username":"cqlcp","avatar":"//image.lceda.cn/avatars/2026/1/FneZQD4JKfDDm92UUIa483axw2OD9PF1E07L9Aby.webp"}}|
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{"type":"META","ticket":1745,"id":"META"}||{"title":"U263-163N-4OS1735","tags":["连接器","USB连接器"],"source":"137125de80bc4e84b0d32cfc4f8d5085|0819f05c4eef4c71ace90d822a990e87","images":["https://alimg.szlcsc.com/upload/public/product/middle/20230105/8C4C253BE73EF32C365FA45A0B7DC44A.jpg"],"attributes":{"LCSC Part Name":"Type-C 母座 卧贴","Supplier Part":"C2931472","Manufacturer":"XKB Connectivity(中国星坤)","Manufacturer Part":"U263-163N-4OS1735","Supplier Footprint":"SMD","JLCPCB Part Class":"扩展库","Datasheet":"https://atta.szlcsc.com/upload/public/pdf/source/20211215/D777AAC9FA67A227A25094451B68E75F.pdf","Supplier":"LCSC","Add into BOM":"yes","Convert to PCB":"yes","Symbol":"43af8e0fa0ed4e3c9fe341ef56095154","Designator":"U?","Footprint":"6b553b66b6db472bb051dda57a3c9931","3D Model":"01a9bc361636459d8939608d246fbb24","3D Model Title":"TYPE-C-SMD_U263-163N-4GS1735","3D Model Transform":"351.9678,301.181,0,0,0,0,0,-48.228,-39.37","Connector Type":"Type-C","Standard":"USB 3.1","Gender":"母座","Number of Contacts":"16","Number of Ports":"1","Mounting Style":"卧贴","Current Rating - Power (Max)":"5A","Contact Material":"铜合金","Contact Plating":"金","Operating Temperature Range":"-25℃~+85℃","Welding Temperature (Max)":"260℃","Name":"={Manufacturer Part}","Description":"连接器类型:Type-C;标准:USB 3.1;公母:母座;触点数量:16;端口数量:1;安装方式:卧贴;额定电流 - 电源:5A;触头材质:铜合金;触头镀层:金;工作温度范围:-25℃~+85℃;焊接温度(最大值):260℃;"}}|
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