Add EasyEDA Pro 2.x legacy source ingestion (5/5 batch closure)
补齐前一批失败的 2 个 legacy Pro 项目（立创·泰山派 RK3566、立创·梁山派），
打通 Pro 2.x 旧版工程的源抓取链路。结合上一 commit 的 modern Pro 3.x
路径，本仓库 5/5 Pro 项目 EPRO2/dataStr 全部端到端打通。
Pro 2.x 与 Pro 3.x 是两个完全不同的存储模型：
- Pro 3.x：git-style branch + linear history chain，AES-128-GCM 加密的
EPRO2 增量消息流，按 history 重放（已在前一 commit 打通）
- Pro 2.x：无 branch / 无 history。文档以 EasyEDA Std plaintext dataStr
存储（同 ["DOCTYPE","SCH","1.1"] 格式），按 doc UUID 通过
/api/v2/documents/lists 批量 GET，主体无加密，只组件库走 AES
Pro 2.x 抓取链由 HAR (tmp/prodownload3.har, 178 请求) 反推：
GET /api/v4/projects/<P> → boards: [{sch, pcb, name}]
GET /api/projects/<P>/ticket?uuid=&g_ticket=-1
→ 完整项目 manifest
POST /api/schematic/lists {uuids:[<sch>]} → sort: [{uuid:<sheet>}]
POST /api/v2/documents/lists {uuids,docType:1} → schematic plaintext
POST /api/v2/documents/lists {uuids,docType:3} → PCB plaintext
POST /api/coppers/search {paths} → 铺铜层
POST /api/textpath/search {paths,project_uuid}→ 字体/文字
POST /api/v2/resources/search {hash,project_uuid} → BLOB 图片
实现：
- crawlers/oshwhub/crawler.py:
- fetch_pro_source() refactor 成 dispatcher，先 GET project meta
检查 branch_uuid，null 即旧版走 _fetch_pro_legacy()，非空走
_fetch_pro_modern()
- _fetch_pro_legacy() 新增（按上面 9 步流程拉所有 doc + 辅助层）
- _pro_post_json() POST helper（与 _pro_get_json 对称）
- schemas/project.schema.json: source_format enum 加 easyeda-pro-legacy
- docs/sources/easyeda_pro_source.md rev 4: §1.1 旧版 vs 新版判别表更新、
§2.7 新增旧版抓取流程 + 实测数据
落盘约定（旧版）：
source/ticket.json 完整 manifest
source/<sheet_uuid>.json 每张原理图（含 dataStr）
source/pcb_<pcb_uuid>.json 每块 PCB
source/coppers.json/textpath.json/blobs.json 辅助 PCB 层资源
source/manifest.json 索引
实测：
立创·梁山派 editor=2.1.30, 2 sheets+1 pcb, 1.0 MB, 78 sym/191 fp/128 dev
立创·泰山派 RK3566 editor=2.1.40, 29 sheets+1 pcb, 0.8 MB, 299 sym/524 fp/295 dev
旧版项目体量比新版小两个数量级（梁山派 1 MB vs RK3576 66 MB）—— 没有
增量 history，组件库走单独端点，本身就是当前快照。
5/5 Pro 项目终极汇总：
X86 主板 easyeda-pro 3.2.15 7374 docs / 481 MB
泰山派 RK3566 easyeda-pro-legacy 2.1.40 30 docs / 0.8 MB
梁山派 easyeda-pro-legacy 2.1.30 3 docs / 1.0 MB
220V 桌面电源 easyeda-pro 3.2.69 771 docs / 26 MB
ESP-VoCat easyeda-pro 3.2.91 278 docs / 7.5 MB
共 8456 docs / ~516 MB plain。
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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